A153959 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 8 ones in any 4 X 4 X 4 subtriangle.

1, 2, 2, 4, 14, 30, 115, 828, 3660, 28651, 410624, 3536757, 55125559, 1557898288, 26483635060, 817051497081, 45621238929239, 1539285306198573, 94040987955305211, 10408016063898858833, 695899462150268059855

Offset

0,2

Links

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

Crossrefs

Sequence in context: A153953 A019072 A019073 * A308847 A006205 A360194

Adjacent sequences: A153956 A153957 A153958 * A153960 A153961 A153962

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved