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A153922 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 3 X 3 X 3 subtriangle. 0
1, 2, 2, 3, 4, 8, 13, 36, 59, 160, 431, 1207, 3281, 14493, 40909, 190825, 830228, 4020596, 18120315, 138139135, 645018986, 5068850751, 37171002203, 301985114648, 2294433300268, 29211683338424, 229716243590382 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..26.

CROSSREFS

Sequence in context: A320009 A147558 A032243 * A153943 A049309 A239967

Adjacent sequences:  A153919 A153920 A153921 * A153923 A153924 A153925

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified February 22 04:58 EST 2020. Contains 332115 sequences. (Running on oeis4.)