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A153911 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 2 ones in any 3 X 3 X 3 subtriangle. 0
1, 2, 412, 3309, 6170, 28173, 363650, 995263, 7017397, 125707566, 496907299, 5084773943, 131364083278, 749724226722, 10945594000512, 414717014027555, 3429998068477278, 72977331677447737, 3992874305065142952 (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: A283661 A067827 A070269 * A259562 A177321 A080392

Adjacent sequences:  A153908 A153909 A153910 * A153912 A153913 A153914

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2009

STATUS

approved

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Last modified October 25 17:22 EDT 2021. Contains 348255 sequences. (Running on oeis4.)