A195888 - OEIS

A195888

Number of lower triangles of an n X n integer array with all row and column sums zero and all row and column sums of squares <=32

1, 1, 9, 369, 68551, 65530899, 314737269521 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,3`
	COMMENTS	`Column 4 of A195892`
	LINKS	`Table of n, a(n) for n=1..7.`
	EXAMPLE	`Some solutions for n=4` `..0........0........0........0........0........0........0........0` `..3-3.....-4.4.....-2.2......4-4......4-4.....-3.3.....-2.2......2-2` `..1.3-4....2-3.1....2-1-1...-3.4-1....0.0.0....0.1-1....2.1-3...-4.4.0` `.-4.0.4.0..2-1-1.0..0-1.1.0.-1.0.1.0.-4.4.0.0..3-4.1.0..0-3.3.0..2-2.0.0`
	CROSSREFS	`Sequence in context: A162133 A197179 A344338 * A162084 A195518 A302131` `Adjacent sequences: A195885 A195886 A195887 * A195889 A195890 A195891`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Sep 24 2011`
	STATUS	`approved`

Last modified March 20 14:05 EDT 2023. Contains 361383 sequences. (Running on oeis4.)