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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.
0
1, 2, 4, 15, 38, 236, 1250, 13966, 128542, 2461620, 40144584, 1355506385, 38359079886, 2280018933124, 113583264552803, 11849601571255761, 1037356176207581620, 189822553366119038561
OFFSET
0,2
CROSSREFS
Sequence in context: A007122 A005219 A153945 * A055466 A342957 A148267
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved