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A153928
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 2, 3, 3, 4, 4, 11, 13, 23, 52, 78, 125, 442, 560, 1364, 4023, 8112, 18507, 78876, 143191, 474516, 1865001, 4873926, 14609812, 86022947, 196603644, 883908229, 4638184260, 15946489644, 63408340357
OFFSET
0,2
CROSSREFS
Sequence in context: A337587 A326439 A136537 * A119446 A302680 A302515
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved