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A153938 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 5 ones in any 3 X 3 X 3 subtriangle. 0
1, 2, 2, 3, 15, 24, 95, 901, 2926, 22625, 415047, 2632895, 39794767, 1442122393, 17977314936, 535815289761, 38169625321927, 935805308861487, 54839755115620718, 7680772354691458379, 370282826884218784372 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A275565 A275090 A274983 * A060790 A109843 A341768

Adjacent sequences:  A153935 A153936 A153937 * A153939 A153940 A153941

KEYWORD

nonn,changed

AUTHOR

R. H. Hardin, Jan 03 2009

STATUS

approved

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Last modified May 9 19:24 EDT 2021. Contains 343746 sequences. (Running on oeis4.)