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A153953
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 7 ones in any 4 X 4 X 4 subtriangle.
0
1, 2, 2, 4, 14, 27, 101, 792, 2945, 22285, 347018, 2474658, 35967994, 1067132131, 14741727949, 415083462852, 23780332109409, 637547853540004, 34814820669689930
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..18.
CROSSREFS
Sequence in context:
A153956
A153962
A261980
*
A019072
A019073
A153959
Adjacent sequences:
A153950
A153951
A153952
*
A153954
A153955
A153956
KEYWORD
nonn
AUTHOR
R. H. Hardin
Jan 03 2009
STATUS
approved
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Last modified July 27 09:47 EDT 2024. Contains 374647 sequences. (Running on oeis4.)