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A153916 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 4 X 4 X 4 subtriangle. 0
1, 2, 1, 1, 2, 2, 3, 6, 7, 14, 21, 38, 56, 157, 218, 502, 1201, 2460, 4784, 17658, 30630, 97836, 276873, 784468, 1952042, 9254403, 20443559, 84386183, 315136918, 1139402048, 3692342904 (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: A181885 A116560 A103784 * A238597 A045870 A229037

Adjacent sequences:  A153913 A153914 A153915 * A153917 A153918 A153919

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified February 21 19:26 EST 2018. Contains 299422 sequences. (Running on oeis4.)