A153992 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 10 ones in any 5 X 5 X 5 subtriangle.

1, 2, 4, 16, 64, 447, 3366, 48406, 708304, 19960973, 570218721, 31360806160, 1749984725579, 187910820807765, 20470104106684190, 4283194032962518137

Offset

0,2

Links

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

Crossrefs

Sequence in context: A113247 A280132 A138870 * A153995 A153998 A154001

Adjacent sequences: A153989 A153990 A153991 * A153993 A153994 A153995

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved