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A153950 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 6 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 4, 11, 16, 47, 268, 865, 4671, 46197, 216961, 1952323, 31953148, 252461942, 3687648150, 101320234793 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..16.

CROSSREFS

Sequence in context: A280531 A072074 A052338 * A153947 A298778 A260878

Adjacent sequences:  A153947 A153948 A153949 * A153951 A153952 A153953

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified September 27 19:04 EDT 2020. Contains 337388 sequences. (Running on oeis4.)