A156442 - OEIS

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A156442

Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 6.

0

2, 0, 7, 0, 870, 0, 68180, 0, 18391220, 0, 10399874310, 0, 10075020851140, 0, 14707103186511120, 0

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OFFSET

4,1

LINKS

Table of n, a(n) for n=4..19.

CROSSREFS

Sequence in context: A266220 A022897 A192496 * A268683 A174968 A254445

Adjacent sequences: A156439 A156440 A156441 * A156443 A156444 A156445

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved