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A153952 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 6 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 4, 5, 8, 11, 40, 59, 169, 555, 1319, 3615, 20488, 46826, 218870, 1193201, 4783860, 22240814, 199704231, 805091958, 6227071279, 56791304489, 381075628434, 2947943372020, 45668975412143, 300746133172408 (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: A006206 A060280 A095719 * A050364 A078465 A094992

Adjacent sequences:  A153949 A153950 A153951 * A153953 A153954 A153955

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified October 23 16:40 EDT 2020. Contains 337969 sequences. (Running on oeis4.)