A153907 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 5 X 5 X 5 subtriangle.

1, 2, 1, 1, 2, 1, 2, 3, 2, 3, 5, 5, 4, 10, 7, 10, 18, 18, 20, 54, 43, 69, 145, 149, 219, 551, 486, 835, 1828, 2107, 2978

Offset

0,2

Links

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

Crossrefs

Sequence in context: A161067 A161106 A161041 * A029306 A337511 A261363

Adjacent sequences: A153904 A153905 A153906 * A153908 A153909 A153910

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved