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A153995
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 11 ones in any 5 X 5 X 5 subtriangle.
0
1, 2, 4, 16, 64, 480, 3736, 56603, 866980, 25953214, 787663876, 46715890643, 2808165369921, 329814202089783, 39245990906253437, 9118402420254407206, 2146932074632111803427
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OFFSET
0,2
LINKS
Table of n, a(n) for n=0..16.
CROSSREFS
Sequence in context:
A280132
A138870
A153992
*
A153998
A154001
A154004
Adjacent sequences:
A153992
A153993
A153994
*
A153996
A153997
A153998
KEYWORD
nonn
AUTHOR
R. H. Hardin
Jan 04 2009
STATUS
approved
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Last modified March 28 16:58 EDT 2024. Contains 371254 sequences. (Running on oeis4.)