A153904 Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 4 X 4 X 4 subtriangle.

1, 2, 1, 1, 2, 2, 2, 4, 3, 5, 6, 8, 8, 24, 15, 28, 52, 66, 85, 246, 226, 453, 898, 1300, 1806, 6204, 5820, 13820, 31156, 51179, 81402

Offset

0,2

Links

Table of n, a(n) for n=0..30.

Crossrefs

Sequence in context: A240071 A029255 A029272 * A128762 A096396 A126307

Adjacent sequences: A153901 A153902 A153903 * A153905 A153906 A153907

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved