A153908 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 2 X 2 X 2 subtriangle.

1, 2, 1, 2, 13, 14, 44, 452, 799, 4626, 86710, 273752, 2781435, 91537826, 508729354, 9157300668, 533484637064, 5243172893020, 166735484693868, 17161483714082216, 298035643554185774, 16752470174524734906, 3047662126271875592300

Offset

0,2

Links

Table of n, a(n) for n=0..22.

Crossrefs

Sequence in context: A342463 A052579 A266314 * A048296 A016542 A242085

Adjacent sequences: A153905 A153906 A153907 * A153909 A153910 A153911

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved