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Search: id:A153997
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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
1, 2, 2, 4, 16, 31, 122, 973, 3890, 30317, 486144, 3845485, 61098761, 1952652536, 30753790733, 973261651722, 61980407029298, 1943138871957133, 122570367648067555 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Sequence in context: A153991 A153994 A102864 this_sequence A154000 A154003 A009542

Adjacent sequences: A153994 A153995 A153996 this_sequence A153998 A153999 A154000

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Jan 04 2009

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

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