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.

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

Offset

0,2

Links

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

Crossrefs

Sequence in context: A116560 A309224 A103784 * A238597 A045870 A309890

Adjacent sequences: A153913 A153914 A153915 * A153917 A153918 A153919

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved