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A153993 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 10 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 4, 8, 12, 23, 90, 162, 611, 2402, 8560, 32187, 246141, 874521, 6300203, 48576212, 330649842, 2414376086, 35637800561, 246608696517, 3459350545304, 51985154551969, 691390369850685, 9855466810408009, 284813053880252248 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
Table of n, a(n) for n=0..25.
CROSSREFS
Sequence in context: A078044 A348851 A329664 * A244781 A052907 A048114
Adjacent sequences: A153990 A153991 A153992 * A153994 A153995 A153996
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved

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Last modified September 1 03:07 EDT 2024. Contains 375575 sequences. (Running on oeis4.)