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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
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..25.
CROSSREFS
Sequence in context:
A325786
A244457
A325908
*
A067953
A109070
A169973
Adjacent sequences:
A153967
A153968
A153969
*
A153971
A153972
A153973
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jan 03 2009
STATUS
approved
