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A153928 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 5 X 5 X 5 subtriangle. 0
1, 2, 2, 3, 3, 4, 4, 11, 13, 23, 52, 78, 125, 442, 560, 1364, 4023, 8112, 18507, 78876, 143191, 474516, 1865001, 4873926, 14609812, 86022947, 196603644, 883908229, 4638184260, 15946489644, 63408340357 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..30.

CROSSREFS

Sequence in context: A035679 A326439 A136537 * A119446 A302680 A302515

Adjacent sequences:  A153925 A153926 A153927 * A153929 A153930 A153931

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 9 22:36 EDT 2020. Contains 333382 sequences. (Running on oeis4.)