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A156478 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 22. 0
2, 44, 40, 7838, 31206, 5100574, 62202832, 23258023832, 999916709280, 912189500014368 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,1

LINKS

Table of n, a(n) for n=3..12.

CROSSREFS

Sequence in context: A088466 A177490 A203498 * A156508 A239865 A007367

Adjacent sequences:  A156475 A156476 A156477 * A156479 A156480 A156481

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified June 24 19:55 EDT 2021. Contains 345425 sequences. (Running on oeis4.)