A153913 - OEIS

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A153913

Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 2 ones in any 3 X 3 X 3 subtriangle.

1, 2, 26, 129, 122, 239, 1864, 1591, 5085, 36162, 47771, 138927, 1581118, 1910444, 8834202, 91938135, 174908406, 743306687, 12298725970, 21309347213, 143524473375, 2166989721589, 5956644162405, 36651705702510

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

CROSSREFS

Sequence in context: A120551 A120547 A132470 * A246586 A067851 A072415

Adjacent sequences: A153910 A153911 A153912 * A153914 A153915 A153916

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2009

STATUS

approved