A153991 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 10 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 16, 26, 107, 826, 3054, 23077, 376116, 2691940, 40600759, 1272412451, 17792826487, 517514558991, 31410446834698

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Crossrefs

Sequence in context: A395972 A392124 A387476 * A153994 A102864 A153997

Adjacent sequences: A153988 A153989 A153990 * A153992 A153993 A153994

Keyword

nonn

Author

R. H. Hardin, Jan 04 2009

Status

approved