A153942 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 5 ones in any 4 X 4 X 4 subtriangle.

1, 2, 4, 15, 38, 236, 1250, 13966, 128542, 2461620, 40144584, 1355506385, 38359079886, 2280018933124, 113583264552803, 11849601571255761, 1037356176207581620, 189822553366119038561

Offset

0,2

Links

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

Crossrefs

Sequence in context: A007122 A005219 A153945 * A055466 A342957 A148267

Adjacent sequences: A153939 A153940 A153941 * A153943 A153944 A153945

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved