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A153947
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 6 ones in any 4 X 4 X 4 subtriangle.
0
1, 2, 2, 4, 11, 23, 83, 542, 2154, 15035, 184615, 1315991, 16739106, 377984235, 5010747205, 118406407922, 4950057264228, 123458500863829
OFFSET
0,2
CROSSREFS
Sequence in context: A072074 A052338 A153950 * A298778 A260878 A064880
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved