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A153933
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 4 X 4 X 4 subtriangle.
0
1, 2, 4, 13, 26, 135, 581, 5081, 33999, 455470, 5028919, 110445068, 1936072745, 69174531647, 1977766145879, 114385090415133, 5299105178883837, 494911099658091565, 37117101455488584937
OFFSET
0,2
CROSSREFS
Sequence in context: A189583 A153936 A027301 * A128601 A034500 A261455
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved