A156509 - OEIS

A156509

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45.

2, 12, 390, 12963, 1881506, 1336889688, 9293294524192, 249490585063875516 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`2,1`
	LINKS	`Table of n, a(n) for n=2..9.`
	CROSSREFS	`Sequence in context: A012547 A009706 A012551 * A229919 A287679 A051009` `Adjacent sequences: A156506 A156507 A156508 * A156510 A156511 A156512`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Feb 09 2009`
	STATUS	`approved`

Last modified August 12 13:59 EDT 2022. Contains 356077 sequences. (Running on oeis4.)