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A156520 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 64. 0
1, 2, 2, 7, 19, 50198, 788009, 1184902962, 55064648562 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Sequence in context: A049955 A184714 A156464 * A307426 A069101 A221648

Adjacent sequences:  A156517 A156518 A156519 * A156521 A156522 A156523

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified May 31 09:30 EDT 2020. Contains 334748 sequences. (Running on oeis4.)