A153919 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 5 X 5 X 5 subtriangle.

1, 2, 1, 1, 2, 1, 2, 5, 4, 7, 14, 16, 20, 63, 57, 108, 299, 347, 613, 2185, 2276, 5449, 17797, 25318, 53655, 235092, 303467, 840222, 3331923, 5849149, 14333903

Offset

0,2

Links

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

Crossrefs

Sequence in context: A049824 A376580 A133087 * A185286 A153905 A327812

Adjacent sequences: A153916 A153917 A153918 * A153920 A153921 A153922

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved