A154003 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 14 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 16, 31, 127, 1022, 3968, 31615, 522452, 4046545, 64740079, 2139507457, 33141584010, 1060370812952, 70075095621417, 2170882674817801, 138906713889097397, 18358078405131502988, 1137379282035136497300

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Sequence in context: A102864 A153997 A154000 * A291338 A326481 A009542

Adjacent sequences: A154000 A154001 A154002 * A154004 A154005 A154006

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved