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A156465 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 16. 0
1, 0, 0, 3, 7, 36, 201, 9522, 78762, 5281910, 225908440, 34459271550, 1556654915420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..13.

CROSSREFS

Sequence in context: A047158 A221511 A102917 * A049366 A081010 A100377

Adjacent sequences: A156462 A156463 A156464 * A156466 A156467 A156468

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified March 27 05:46 EDT 2023. Contains 361554 sequences. (Running on oeis4.)