A153955 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 7 ones in any 4 X 4 X 4 subtriangle.

1, 2, 2, 4, 6, 13, 23, 76, 165, 617, 1952, 8422, 29972, 193873, 777019, 5693242, 34246559, 286416710, 1965573794, 24471858943, 192131736735, 2728790310401, 31916724706299, 517007594073133, 6892905760719871, 166582982535806342

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Crossrefs

Sequence in context: A363578 A209025 A346779 * A074028 A181926 A061894

Adjacent sequences: A153952 A153953 A153954 * A153956 A153957 A153958

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved