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A343874

Array read by antidiagonals: T(n,k) is the number of n X n nonnegative integer matrices with sum of elements equal to k, up to rotational symmetry.

1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 3, 3, 1, 0, 1, 5, 13, 4, 1, 0, 1, 10, 43, 36, 7, 1, 0, 1, 14, 129, 204, 85, 9, 1, 0, 1, 22, 327, 980, 735, 171, 13, 1, 0, 1, 30, 761, 3876, 5145, 2109, 313, 16, 1, 0, 1, 43, 1619, 13596, 29715, 20610, 5213, 528, 21, 1

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OFFSET

0,13

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..1325

EXAMPLE

Array begins:

=====================================================

n\k | 0 1 2 3 4 5 6 7

----+------------------------------------------------

0 | 1 0 0 0 0 0 0 0 ...

1 | 1 1 1 1 1 1 1 1 ...