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A153935 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 4 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 3, 8, 6, 19, 86, 201, 747, 4737, 13222, 67580, 644447, 2591663, 18812351, 265019022, 1467585490, 15658902928, 326360337439 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..19.

CROSSREFS

Sequence in context: A056762 A213329 A069830 * A153944 A046652 A319860

Adjacent sequences:  A153932 A153933 A153934 * A153936 A153937 A153938

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified February 24 01:16 EST 2020. Contains 332195 sequences. (Running on oeis4.)