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A153896 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 1 one in any 2 X 2 X 2 subtriangle. 0
1, 2, 1, 2, 6, 6, 12, 54, 68, 200, 1266, 2320, 9256, 81946, 206828, 1160264, 14343496, 50776328, 396238264, 6835424230, 33707147400, 367462965472, 8846443274706, 60917276216360, 926358873081664, 31121060447968362, 298982889913216056 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

CROSSREFS

Sequence in context: A219570 A094965 A025277 * A074727 A059587 A070236

Adjacent sequences:  A153893 A153894 A153895 * A153897 A153898 A153899

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified December 21 02:15 EST 2014. Contains 252291 sequences.