A153989 - OEIS

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A153989

Number of planar n X n X n binary triangular grids with every one adjacent to exactly 2 other ones.

1, 1, 2, 5, 11, 46, 267, 1767, 17587, 243760, 4437947, 112889388, 3947281130, 187476143214, 12242161648191, 1095392081180001, 134002137948473492, 22462563463091094957, 5156385913433257078626 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	CROSSREFS	`Sequence in context: A128231 A088148 A088149 * A160859 A106887 A089609` `Adjacent sequences: A153986 A153987 A153988 * A153990 A153991 A153992`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Jan 04 2009`

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Last modified February 17 14:19 EST 2012. Contains 206038 sequences.