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A153905
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 1 one in any 5 X 5 X 5 subtriangle.
0
1, 2, 1, 1, 2, 1, 2, 5, 6, 9, 17, 17, 26, 58, 75, 126, 312, 396, 728, 2092, 2615, 5251, 16697, 25367, 59223, 199945, 337534, 830329, 2967422, 5495637, 14867026
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..30.
CROSSREFS
Sequence in context:
A133087
A153919
A185286
*
A327812
A319093
A228726
Adjacent sequences:
A153902
A153903
A153904
*
A153906
A153907
A153908
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jan 03 2009
STATUS
approved
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Last modified June 8 15:50 EDT 2024. Contains 373223 sequences. (Running on oeis4.)