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A153997
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 12 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 2, 4, 16, 31, 122, 973, 3890, 30317, 486144, 3845485, 61098761, 1952652536, 30753790733, 973261651722, 61980407029298, 1943138871957133, 122570367648067555
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..18.
CROSSREFS
Sequence in context:
A153991
A153994
A102864
*
A154000
A154003
A291338
Adjacent sequences:
A153994
A153995
A153996
*
A153998
A153999
A154000
KEYWORD
nonn
AUTHOR
R. H. Hardin
Jan 04 2009
STATUS
approved
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Last modified September 6 00:26 EDT 2024. Contains 375701 sequences. (Running on oeis4.)