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Search: id:A153970
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A153970 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 5 X 5 X 5 subtriangle. +0
1
1, 2, 2, 4, 7, 12, 22, 77, 142, 532, 1881, 6680, 23965, 163600, 576849, 3866824, 26635009, 176366633, 1204710337, 15393505413, 104674234457, 1334666498849, 17456897665295, 221752333314343, 2885843552520634, 70795502834846238 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A032162 A000983 A095325 this_sequence A067953 A109070 A049868

Adjacent sequences: A153967 A153968 A153969 this_sequence A153971 A153972 A153973

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 03 2009

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Last modified December 17 19:39 EST 2009. Contains 170821 sequences.

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