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A153967 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 9 ones in any 4 X 4 X 4 subtriangle. 0
1, 2, 2, 4, 7, 15, 30, 103, 229, 913, 3237, 14316, 56401, 399787, 1756484, 13874163, 97904334, 862620519, 6788122417, 96037644217, 842802659086, 13301955362056, 187438690067450, 3299373199801311, 51852238684408496, 1465485312975753622 (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: A049904 A049906 A014265 * A052949 A014266 A032441

Adjacent sequences:  A153964 A153965 A153966 * A153968 A153969 A153970

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified September 15 08:13 EDT 2019. Contains 327062 sequences. (Running on oeis4.)