A160991 - OEIS

A160991

Row sums of triangle defined in A112593.

1, 3, 15, 25, 42, 74, 96, 126, 156, 177, 268, 393, 293, 527, 573, 732, 623, 772, 887, 903, 1029, 1010, 1333, 1398, 1353, 1594, 2104, 1786, 1923, 1971, 2847, 2744, 2560, 2282, 3128, 3133, 2850, 3634, 3795, 2976, 4212, 4092, 4413, 4596, 4605, 4679, 6177, 5158

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..48.

EXAMPLE

Fifth row is 7, 5, 5, 5, 0, 5, 5, 5, 5, so a(5) = 42.

PROG

(Magma) S:=[[1]]; for i in [2..48] do Append(~S, [ &+[ Gcd(S[i-1][k], j) eq 1 select 1 else 0: k in [1..2*i-3] ]: j in [1..2*i-1] ]); end for; [ &+R: R in S ];

CROSSREFS

Cf. A112593.

Sequence in context: A276938 A046280 A046283 * A328387 A006872 A027179

Adjacent sequences: A160988 A160989 A160990 * A160992 A160993 A160994

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Jun 01 2009

STATUS

approved