A082019 - OEIS

A082019

Diagonal of square array T(n,k) with T(1,1) = 1 where antidiagonals are filled alternating upwards and downwards with the smallest number not already used such that the n-th antidiagonal sum is a multiple of n.

1, 5, 12, 25, 41, 60, 85, 112, 145, 180, 221, 264, 313, 365, 420, 481, 544, 613, 684, 761, 840, 925, 1012, 1105, 1200, 1301, 1404, 1513, 1624, 1741, 1860, 1985, 2112, 2245, 2380, 2521, 2664, 2813, 2964, 3121, 3281, 3444, 3613, 3784, 3961, 4140, 4325, 4512

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OFFSET

1,2

LINKS

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

EXAMPLE

T(n,k) begins:

1, 2, 7, 6, 18, 15, ...

4, 5, 8, 14, 16, 27, ...

3, 9, 12, 17, 26, 31, ...

13, 11, 19, 25, 32, 42, ...

10, 20, 24, 33, 41, 50, ...