A156415 - OEIS

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A156415

Number of 13 X 13 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.

0

1, 120, 0, 0, 14564760, 66083040, 0, 0, 2511725250, 3360660500, 0, 0, 105602337600, 192407274081, 0, 0, 1556654915420, 1665635124840, 0, 0

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A243779 A267335 A357968 * A073836 A242836 A229031

Adjacent sequences: A156412 A156413 A156414 * A156416 A156417 A156418

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 2009

STATUS

approved