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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
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..30.
CROSSREFS
Sequence in context:
A161039
A104467
A132463
*
A132844
A006843
A324797
Adjacent sequences:
A153898
A153899
A153900
*
A153902
A153903
A153904
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jan 03 2009
STATUS
approved
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Last modified March 29 22:15 EDT 2024. Contains 371282 sequences. (Running on oeis4.)