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A153901 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 1 one in any 3 X 3 X 3 subtriangle. 0
1, 2, 1, 1, 3, 2, 2, 7, 3, 6, 15, 12, 17, 63, 47, 86, 272, 269, 423, 2020, 1609, 3902, 14951, 18193, 36083, 200112, 201396, 575152, 2652677, 3907855, 9200561 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..30.

CROSSREFS

Sequence in context: A161039 A104467 A132463 * A132844 A006843 A324797

Adjacent sequences:  A153898 A153899 A153900 * A153902 A153903 A153904

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2009

STATUS

approved

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Last modified June 14 17:31 EDT 2021. Contains 345037 sequences. (Running on oeis4.)