id:A153999 - OEIS Search Results

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Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 12 ones in any 5 X 5 X 5 subtriangle.

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1, 2, 2, 4, 8, 15, 30, 113, 226, 897, 3372, 13821, 54535, 410690, 1677109, 13057708, 99242206, 798041029, 6266181287, 94041421473, 762970233334, 11832424270090, 179170668019138, 2871889457030716, 44959471542344339, 1344474186700872579 (list; graph; listen)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A000018 A075126 A098788 this_sequence A154002 A154005 A054243` `Adjacent sequences: A153996 A153997 A153998 this_sequence A154000 A154001 A154002`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net) Jan 04 2009`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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