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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, 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; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A325786 A244457 A325908 * A067953 A109070 A169973
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved

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Last modified May 28 01:34 EDT 2024. Contains 372900 sequences. (Running on oeis4.)