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A153999
Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 12 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 2, 4, 8, 15, 30, 113, 226, 897, 3372, 13821, 54535, 410690, 1677109, 13057708, 99242206, 798041029, 6266181287, 94041421473, 762970233334, 11832424270090, 179170668019138, 2871889457030716, 44959471542344339, 1344474186700872579
OFFSET
0,2
CROSSREFS
Sequence in context: A300998 A098788 A190820 * A154002 A154005 A222386
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved