A153962 Number of planar n X n X n binary triangular grids symmetric under 120 degree rotation with no more than 8 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 14, 16, 75, 552, 1667, 11886, 186036, 1025514, 13006464, 369745208, 3793772311, 86085692189

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Crossrefs

Sequence in context: A121526 A339282 A153956 * A261980 A153953 A019072

Adjacent sequences: A153959 A153960 A153961 * A153963 A153964 A153965

Keyword

nonn,more

Author

R. H. Hardin, Jan 03 2009

Status

approved