A153949 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 6 ones in any 4 X 4 X 4 subtriangle.

1, 2, 2, 4, 5, 11, 19, 64, 124, 431, 1327, 5041, 16256, 101123, 343523, 2315198, 12588566, 91251647, 541807894, 6226655381, 40196314396, 497995326239, 5136985473929, 68806411497081, 764460274355923, 16405775345542751

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Crossrefs

Sequence in context: A103420 A329701 A032258 * A302400 A175954 A371162

Adjacent sequences: A153946 A153947 A153948 * A153950 A153951 A153952

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved