%I #10 Sep 15 2016 12:23:23

%S 4,4,8,4,10,10,4,8,12,20,4,10,12,20,16,4,8,12,22,12,24,4,10,10,24,16,

%T 26,38,4,8,10,24,14,30,40,20,4,10,14,22,14,20,38,18,34,4,8,10,16,12,

%U 32,34,14,22,40,4,10,10,22,20,26,38,22,34,68,36,4,8,12,28,14,18,40,14,26,46,36,22,4,10,12,20,8,30,48,12,30,74,28,14,34

%N Square array A(row,col) = A276610(row,col+1) - A276610(row,col): the first differences of each row of array A276610, read by descending antidiagonals as A(1,1), A(1,2), A(2,1), A(1,3), A(2,2), A(3,1), ...

%C The first negative term occurs as a(490) = A(25,7) = A276610(25,8) - A276610(25,7) = 248 - 258 = -10.

%H Antti Karttunen, <a href="/A276620/b276620.txt">Table of n, a(n) for n = 1..10440; the first 144 antidiagonals of array</a>

%F A(row,col) = A276610(row,col+1) - A276610(row,col).

%e The top left 18 x 16 corner of the array:

%e 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4

%e 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10, 8, 10

%e 10, 12, 12, 12, 10, 10, 14, 10, 10, 12, 12, 12, 10, 10, 14, 10, 10, 12

%e 20, 20, 22, 24, 24, 22, 16, 22, 28, 20, 22, 20, 20, 26, 20, 22, 24, 22

%e 16, 12, 16, 14, 14, 12, 20, 14, 8, 22, 12, 12, 18, 12, 12, 18, 14, 14

%e 24, 26, 30, 20, 32, 26, 18, 30, 28, 22, 28, 30, 28, 20, 30, 24, 28, 26

%e 38, 40, 38, 34, 38, 40, 48, 34, 32, 40, 40, 36, 40, 44, 36, 40, 36, 32

%e 20, 18, 14, 22, 14, 12, 20, 22, 20, 16, 18, 12, 20, 10, 24, 18, 18, 18

%e 34, 22, 34, 26, 30, 40, 20, 30, 30, 32, 28, 34, 26, 40, 26, 26, 30, 32

%e 40, 68, 46, 74, 52, 48, 70, 40, 64, 66, 46, 58, 58, 48, 58, 62, 58, 52

%e 36, 36, 28, 32, 30, 28, 18, 58, 28, 20, 38, 26, 30, 50, 30, 28, 22, 44

%e 22, 14, 14, 10, 46, 16, 24, 2, 32, 16, 24, 20, 18, 12, 28, 12, 30, 20

%e 34, 32, 46, 32, 16, 46, 30, 30, 30, 54, 34, 26, 34, 26, 30, 38, 40, 18

%e 52, 44, 40, 52, 40, 56, 58, 60, 28, 24, 64, 52, 54, 66, 30, 54, 30, 66

%e 52, 74, 70, 52, 66, 68, 56, 52, 80, 64, 42, 90, 54, 42, 78, 58, 72, 68

%e 42, 46, 58, 64, 38, 38, 62, 52, 44, 62, 52, 28, 62, 52, 50, 50, 42, 52

%o (Scheme)

%o (define (A276620 n) (A276620bi (A002260 n) (A004736 n)))

%o (define (A276620bi row col) (- (A276610bi row (+ 1 col)) (A276610bi row col))) ;; Code for A276610bi given in A276610.

%Y Transpose: A276619.

%Y Column 1: A276607.

%Y Cf. A276610, A255127.

%K sign,tabl

%O 1,1

%A _Antti Karttunen_, Sep 13 2016