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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. 0
1, 2, 2, 82, 210, 24604, 157700, 153363108, 4197081428, 19984585910224 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 9 10:53 EDT 2021. Contains 343732 sequences. (Running on oeis4.)