A153968 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 9 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 15, 26, 94, 703, 2648, 19064, 286301, 1973740, 27808647, 785297090, 10274423975, 271526039324

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Crossrefs

Sequence in context: A222924 A268423 A261531 * A153965 A121221 A122598

Adjacent sequences: A153965 A153966 A153967 * A153969 A153970 A153971

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved