A153963 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 8 ones in any 5 X 5 X 5 subtriangle.

1, 2, 4, 16, 61, 331, 2182, 26179, 323131, 7261166, 162366708, 6677383044, 277240875794, 21086244209472, 1619660339949369, 226006979439621982

Offset

0,2

Links

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

Crossrefs

Sequence in context: A053349 A228626 A152876 * A153960 A339648 A005027

Adjacent sequences: A153960 A153961 A153962 * A153964 A153965 A153966

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved