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A153984
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 1 other one.
0
1, 1, 1, 1, 1, 2, 3, 2, 6, 7, 11, 23, 54, 60, 238, 445, 901, 2706, 9076, 14494, 80321, 212453, 613603, 2681494, 12847248, 29154102, 230660451, 862931932, 3568146072, 22105400251, 150948368093, 488469303948, 5510650176739, 29467826406958
OFFSET
0,6
CROSSREFS
Sequence in context: A208611 A209582 A158279 * A025502 A110777 A087454
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved