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A153988
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with every one adjacent to exactly 2 other ones.
0
1, 1, 2, 2, 2, 4, 7, 7, 19, 30, 41, 111, 242, 341, 1198, 2798, 5288, 19451, 58386, 113037, 552176, 1717743, 4407296, 22107632, 91701868, 243757707, 1626825070, 6947686128, 24465641567, 168345671664, 954487204861, 3466462776895
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..31.
CROSSREFS
Sequence in context: A005865 A176051 A245257 * A253059 A098705 A029866
Adjacent sequences: A153985 A153986 A153987 * A153989 A153990 A153991
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved

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Last modified October 6 09:01 EDT 2024. Contains 376569 sequences.
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