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A153932 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 3, 8, 13, 39, 225, 564, 2858, 24012, 101231, 758165, 10608857, 69903886, 854166606, 19155776749, 207379552763, 4126912621572 (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: A076541 A227380 A159789 * A158763 A001131 A019177

Adjacent sequences:  A153929 A153930 A153931 * A153933 A153934 A153935

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified July 11 17:24 EDT 2020. Contains 335626 sequences. (Running on oeis4.)