A153954 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 7 ones in any 4 X 4 X 4 subtriangle.

1, 2, 4, 16, 56, 424, 2979, 43547, 596720, 16903736, 450129276, 24740929636, 1274646618498, 135794808093563, 13566737103811527, 2802238029568573488, 542899687293133798346, 217420519981066905114215

Offset

0,2

Links

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

Crossrefs

Sequence in context: A081919 A362524 A232664 * A275764 A053349 A228626

Adjacent sequences: A153951 A153952 A153953 * A153955 A153956 A153957

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved