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A156459 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 13. 0
2, 0, 28, 12, 1412, 3096, 337208, 4171320, 662224128, 16504055920, 4410398887272, 150978985010061, 66490911199244672 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..14.

CROSSREFS

Sequence in context: A157304 A157305 A306416 * A007218 A092177 A104466

Adjacent sequences:  A156456 A156457 A156458 * A156460 A156461 A156462

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified July 17 23:21 EDT 2019. Contains 325109 sequences. (Running on oeis4.)