A153957 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 5 X 5 X 5 subtriangle.

1, 2, 4, 16, 56, 256, 1518, 15896, 171565, 3217779, 58858443, 1927799742, 63170771231, 3671078892600, 213376157401433, 21677971544137049

Offset

0,2

Links

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

Crossrefs

Sequence in context: A005388 A053503 A308381 * A068789 A009624 A009161

Adjacent sequences: A153954 A153955 A153956 * A153958 A153959 A153960

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved