A156476 - OEIS

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A156476

Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 21.

54, 20, 3552, 11364, 2742240, 56271108, 23882769984, 990946452040, 760348893638560 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`4,1`
	LINKS	`Table of n, a(n) for n=4..12.`
	CROSSREFS	`Sequence in context: A033688 A058283 A096510 * A137939 A033374 A116386` `Adjacent sequences: A156473 A156474 A156475 * A156477 A156478 A156479`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Feb 09 2009`
	STATUS	`approved`

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Last modified May 24 00:31 EDT 2013. Contains 225613 sequences.