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A153955 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 7 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 4, 6, 13, 23, 76, 165, 617, 1952, 8422, 29972, 193873, 777019, 5693242, 34246559, 286416710, 1965573794, 24471858943, 192131736735, 2728790310401, 31916724706299, 517007594073133, 6892905760719871, 166582982535806342 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A363578 A209025 A346779 * A074028 A181926 A061894
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 03 2009
STATUS
approved

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Last modified May 22 18:14 EDT 2024. Contains 372758 sequences. (Running on oeis4.)