A156487 - OEIS

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A156487

Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 27.

3, 58, 204, 13400, 102762, 19311868, 365142544, 166203280736, 6303614816380 (list; graph; refs; listen; history; internal format)

	OFFSET	`3,1`
	CROSSREFS	`Sequence in context: A198915 A037107 A041735 * A024218 A049661 A184950` `Adjacent sequences: A156484 A156485 A156486 * A156488 A156489 A156490`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009`

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Last modified February 15 04:23 EST 2012. Contains 205694 sequences.