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Search: id:A153988
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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, 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 (list; graph; listen)
OFFSET

0,3
CROSSREFS

Sequence in context: A000799 A063823 A005865 this_sequence A098705 A029866 A161421

Adjacent sequences: A153985 A153986 A153987 this_sequence A153989 A153990 A153991

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.

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