A153960 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 4 X 4 X 4 subtriangle.

1, 2, 4, 16, 61, 481, 3632, 56460, 846246, 26077855, 775360108, 47367748738, 2788988175862, 337520120950504, 39370755765040186, 9439231435010737547, 2181450759732224994542, 1036179888983780783839829

Offset

0,2

Links

Table of n, a(n) for n=0..17.

Crossrefs

Sequence in context: A228626 A152876 A153963 * A339648 A005027 A153969

Adjacent sequences: A153957 A153958 A153959 * A153961 A153962 A153963

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved