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A153910 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 2 X 2 X 2 subtriangle. 0
1, 2, 1, 2, 5, 6, 10, 46, 45, 144, 630, 1282, 3589, 31208, 54740, 306488, 2365846, 8422342, 41318120, 642228152, 1995977194, 19736350274, 269164334206, 1690170177698, 14635326322042, 402751016861848, 2213195936856480 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A047991 A296666 A120898 * A208021 A052532 A006702
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2009
STATUS
approved

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)