A156526 - OEIS

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A156526

Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 81.

1, 2, 8, 184, 772, 77184, 641136, 2194362732 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	CROSSREFS	`Sequence in context: A009713 A009377 A181234 * A009505 A028368 A056990` `Adjacent sequences: A156523 A156524 A156525 * A156527 A156528 A156529`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009`

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Last modified February 14 04:29 EST 2012. Contains 205570 sequences.