A153911 - OEIS

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A153911

Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 3 X 3 X 3 subtriangle.

1, 2, 412, 3309, 6170, 28173, 363650, 995263, 7017397, 125707566, 496907299, 5084773943, 131364083278, 749724226722, 10945594000512, 414717014027555, 3429998068477278, 72977331677447737, 3992874305065142952 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A092701 A067827 A070269 * A177321 A080392 A154541` `Adjacent sequences: A153908 A153909 A153910 * A153912 A153913 A153914`
	KEYWORD	`nonn`
	AUTHOR	`R. H. Hardin (rhhardin(AT)att.net) Jan 03 2009`

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.