A153994 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 11 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 16, 26, 114, 913, 3227, 25373, 441919, 3146641, 49361868, 1683721022, 23850420259, 734273471828, 49324500595954, 1380740815171041

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Crossrefs

Sequence in context: A176190 A106241 A153991 * A102864 A153997 A154000

Adjacent sequences: A153991 A153992 A153993 * A153995 A153996 A153997

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved