A153938 - OEIS

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A153938 - OEIS

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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

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OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A275090 A373310 A274983 * A060790 A109843 A341768

Adjacent sequences: A153935 A153936 A153937 * A153939 A153940 A153941

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2009

STATUS

approved