A166198 - OEIS

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A166198

Number of nXnXn triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= 3

1, 4, 2, 3, 14, 30, 89, 553, 1588, 8865, 104510, 444424, 4173156, 81325310, 652489468, 10459516337, 342881668736, 4580518588744, 125220290825340, 7022575980797573, 156952369257684587 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`0,2`
	LINKS	`Table of n, a(n) for n=0..20.`
	EXAMPLE	`All solutions for n=4` `.....1........0........0........2........1........1........0........0...` `....0.1......0.1......0.0......0.0......0.0......0.0......0.0......1.0..` `...1.0.0....1.0.0....0.2.0....0.1.0....0.1.0....0.2.0....0.3.0....0.0.1.` `..1.0.1.1..0.0.1.0..0.0.0.0..2.0.0.2..1.0.0.1..1.0.0.1..0.0.0.0..0.1.0.0` `------` `.....0........1........1........0........2........3...` `....0.0......1.0......0.0......0.0......0.0......0.0..` `...0.0.0....0.0.1....0.0.0....0.1.0....0.0.0....0.0.0.` `..0.0.0.0..1.1.0.1..1.0.0.1..0.0.0.0..2.0.0.2..3.0.0.3`
	CROSSREFS	`Sequence in context: A341055 A098046 A338247 * A248252 A117238 A197291` `Adjacent sequences: A166195 A166196 A166197 * A166199 A166200 A166201`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin Oct 09 2009`
	STATUS	`approved`

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Last modified January 29 21:02 EST 2023. Contains 359931 sequences. (Running on oeis4.)