A153928 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 3 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 3, 3, 4, 4, 11, 13, 23, 52, 78, 125, 442, 560, 1364, 4023, 8112, 18507, 78876, 143191, 474516, 1865001, 4873926, 14609812, 86022947, 196603644, 883908229, 4638184260, 15946489644, 63408340357

Offset

0,2

Links

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

Crossrefs

Sequence in context: A337587 A326439 A136537 * A119446 A302680 A302515

Adjacent sequences: A153925 A153926 A153927 * A153929 A153930 A153931

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved