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A153929
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 3 X 3 X 3 subtriangle.
0
1, 2, 2, 3, 13, 21, 81, 653, 2032, 13521, 198411, 1134105, 14051578, 384943878, 4075092077, 94920910164, 4841696508264, 95471746290629, 4126780473485202, 391264740388006351, 14349686703845230194, 1153837260755381339313
OFFSET
0,2
CROSSREFS
Sequence in context: A293445 A126339 A268725 * A184843 A100362 A062439
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved