A153956 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 7 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 14, 16, 62, 400, 1312, 8228, 101575, 539692, 5945952, 128078527, 1209629759, 22708191479, 862913200941

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Crossrefs

Sequence in context: A121514 A121526 A339282 * A153962 A261980 A153953

Adjacent sequences: A153953 A153954 A153955 * A153957 A153958 A153959

Keyword

nonn

Author

R. H. Hardin Jan 03 2009

Status

approved