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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

Table of n, a(n) for n=0..25.

CROSSREFS

Sequence in context: A282164 A268175 A209025 * A074028 A181926 A061894

Adjacent sequences:  A153952 A153953 A153954 * A153956 A153957 A153958

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified May 10 13:42 EDT 2021. Contains 343770 sequences. (Running on oeis4.)