A156511 - OEIS

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A156511

Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 49.

1, 2, 2, 82, 210, 24604, 157700, 153363108, 4197081428, 19984585910224

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A303569 A156523 A191779 * A166996 A133295 A055470

Adjacent sequences: A156508 A156509 A156510 * A156512 A156513 A156514

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved