A153523 Number of planar n X n X n binary triangular grids with no more than 2 ones in any 3 X 3 X 3 subtriangle.

1, 2, 7, 22, 132, 1204, 13768, 244089, 6352095, 232890454, 12491887452, 974287563383, 109587446419665, 17874622451841230, 4227153018169110373, 1447295404720506832342, 717895790307321893024403

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Crossrefs

Sequence in context: A049369 A327697 A308548 * A153551 A125285 A170870

Adjacent sequences: A153520 A153521 A153522 * A153524 A153525 A153526

Keyword

nonn

Author

R. H. Hardin, Jan 01 2009

Status

approved