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A153961 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 8 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 4, 6, 14, 27, 80, 210, 805, 2370, 12127, 45783, 276334, 1343098, 10464249, 60421447, 607880695, 4555562667, 54131941863, 525633914241, 8090369486591, 92774939175347, 1849817523944554, 27457199067870165, 646952049880982614 (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: A116684 A276057 A116637 * A134041 A069925 A227315

Adjacent sequences:  A153958 A153959 A153960 * A153962 A153963 A153964

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 10 00:05 EDT 2020. Contains 333392 sequences. (Running on oeis4.)