A156429 - OEIS

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A156429

Number of 20X20 arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to n.

1, 30240, 569744280, 1972495637280, 1600434039456630, 374736233227188672 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A027687 A190475 A109485 * A171263 A187376 A187373` `Adjacent sequences: A156426 A156427 A156428 * A156430 A156431 A156432`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.