id:A154005 - 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 14 ones in any 5 X 5 X 5 subtriangle.

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1, 2, 2, 4, 8, 15, 31, 126, 240, 943, 3992, 15073, 60221, 508875, 1923344, 15346988, 129704729, 978528991, 7823328579, 131906890104, 997545267990, 15909346537935, 268935937214485, 4056896542025441, 64868711455854407, 2187311046708551809 (list; graph; listen)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A098788 A153999 A154002 this_sequence A054243 A005864 A112433` `Adjacent sequences: A154002 A154003 A154004 this_sequence A154006 A154007 A154008`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhhardin(AT)att.net) Jan 04 2009`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research