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A153901
Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 3 X 3 X 3 subtriangle.
0
1, 2, 1, 1, 3, 2, 2, 7, 3, 6, 15, 12, 17, 63, 47, 86, 272, 269, 423, 2020, 1609, 3902, 14951, 18193, 36083, 200112, 201396, 575152, 2652677, 3907855, 9200561
OFFSET
0,2
CROSSREFS
Sequence in context: A161039 A104467 A132463 * A132844 A006843 A324797
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved