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A153926 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 3 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 3, 5, 6, 12, 35, 83, 231, 918, 2132, 7575, 42734, 132320, 609928, 4694085, 18109624, 113969565, 1148801096, 6065910343, 51213901318 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..21.

CROSSREFS

Sequence in context: A111077 A283189 A032157 * A035425 A139074 A179418

Adjacent sequences:  A153923 A153924 A153925 * A153927 A153928 A153929

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified February 19 03:54 EST 2020. Contains 332032 sequences. (Running on oeis4.)