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A156462 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 15. 0
22, 0, 3200, 2952, 1651208, 6328576, 2727888448, 31390349120, 15449498784320, 512365063156800 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

LINKS

Table of n, a(n) for n=4..13.

CROSSREFS

Sequence in context: A225343 A252670 A297813 * A040488 A040489 A040490

Adjacent sequences: A156459 A156460 A156461 * A156463 A156464 A156465

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified February 4 20:58 EST 2023. Contains 360082 sequences. (Running on oeis4.)