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A153938
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 5 ones in any 3 X 3 X 3 subtriangle.
0
1, 2, 2, 3, 15, 24, 95, 901, 2926, 22625, 415047, 2632895, 39794767, 1442122393, 17977314936, 535815289761, 38169625321927, 935805308861487, 54839755115620718, 7680772354691458379, 370282826884218784372
OFFSET
0,2
CROSSREFS
Sequence in context: A275090 A373310 A274983 * A060790 A109843 A341768
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved