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A156468 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 18. 0
1, 8, 114, 3704, 285470, 46859304, 17604991124, 15033533213232, 35207864619957092 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..10.

CROSSREFS

Sequence in context: A220635 A113670 A347019 * A293992 A220575 A240890

Adjacent sequences:  A156465 A156466 A156467 * A156469 A156470 A156471

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified January 21 06:26 EST 2022. Contains 350473 sequences. (Running on oeis4.)