A153936 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 5 X 5 X 5 subtriangle.

1, 2, 4, 13, 26, 65, 226, 1291, 7132, 55130, 379228, 4264780, 44700351, 743555327, 11220972023, 261784540652, 5859844173065, 202299825940682, 6575351187836482

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Crossrefs

Sequence in context: A018587 A163986 A189583 * A027301 A153933 A128601

Adjacent sequences: A153933 A153934 A153935 * A153937 A153938 A153939

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved