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A153947 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 6 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 4, 11, 23, 83, 542, 2154, 15035, 184615, 1315991, 16739106, 377984235, 5010747205, 118406407922, 4950057264228, 123458500863829 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Sequence in context: A072074 A052338 A153950 * A298778 A260878 A064880

Adjacent sequences:  A153944 A153945 A153946 * A153948 A153949 A153950

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified October 23 18:19 EDT 2020. Contains 337975 sequences. (Running on oeis4.)