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A154003
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 14 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 2, 4, 16, 31, 127, 1022, 3968, 31615, 522452, 4046545, 64740079, 2139507457, 33141584010, 1060370812952, 70075095621417, 2170882674817801, 138906713889097397, 18358078405131502988, 1137379282035136497300
OFFSET
0,2
CROSSREFS
Sequence in context: A102864 A153997 A154000 * A291338 A326481 A009542
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved