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.

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

Offset

0,2

Links

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

Crossrefs

Sequence in context: A094965 A025277 A248100 * A074727 A059587 A070236

Adjacent sequences: A153893 A153894 A153895 * A153897 A153898 A153899

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved