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A153986
Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with every one adjacent to exactly 2 other ones.
0
1, 1, 2, 2, 2, 4, 9, 15, 37, 88, 191, 729, 2246, 6555, 31434, 144150, 601688, 3970089, 24322158, 135488789, 1251604698, 10410417129, 79632436378, 997602199170, 11483571472544, 120898733308159, 2073714604283068, 32605974669636948
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..27.
CROSSREFS
Sequence in context: A274076 A160179 A021822 * A199889 A293177 A231382
Adjacent sequences: A153983 A153984 A153985 * A153987 A153988 A153989
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved

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Last modified October 5 03:38 EDT 2024. Contains 376530 sequences.
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