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A153941 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 5 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 3, 8, 18, 64, 323, 1239, 7677, 70851, 462347, 4699837, 77982415, 865056340, 15519583779, 437728798867, 8808271045842, 278977031301418 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..18.

CROSSREFS

Sequence in context: A158763 A001131 A019177 * A184844 A252848 A241475

Adjacent sequences:  A153938 A153939 A153940 * A153942 A153943 A153944

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 18 13:56 EDT 2021. Contains 343088 sequences. (Running on oeis4.)