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A153964 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 8 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 4, 6, 8, 17, 62, 97, 362, 1324, 3868, 13138, 92566, 270599, 1645369, 11553340, 61799175, 385381600, 4833634814, 26435310212, 299198500876, 3860046376506, 38367622605338, 439015544648715, 10375069938961300 (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: A153958 A216214 A269298 * A001010 A091966 A231187

Adjacent sequences:  A153961 A153962 A153963 * A153965 A153966 A153967

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 8 21:34 EDT 2020. Contains 333329 sequences. (Running on oeis4.)