A153944 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 5 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 3, 8, 6, 28, 164, 366, 1829, 16995, 53701, 369189, 5605587, 28526549, 299788077, 7021649770, 53533022280

Offset

0,2

Links

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

Crossrefs

Sequence in context: A213329 A069830 A153935 * A046652 A319860 A300354

Adjacent sequences: A153941 A153942 A153943 * A153945 A153946 A153947

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved