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A156457 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 12. 0
1, 4, 0, 18, 90, 5154, 19368, 2108280, 31103100, 3164432181, 105602337600, 14188463179758, 817218706478195 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..15.

CROSSREFS

Sequence in context: A215669 A244310 A334705 * A058348 A184946 A085618

Adjacent sequences:  A156454 A156455 A156456 * A156458 A156459 A156460

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified May 18 10:19 EDT 2021. Contains 343995 sequences. (Running on oeis4.)