A153934 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 4 ones in any 4 X 4 X 4 subtriangle.

1, 2, 2, 3, 4, 7, 9, 37, 44, 122, 360, 837, 1955, 11063, 21562, 102402, 455597, 1800255, 6701316, 61868659, 193623470, 1467251281, 10855933316, 68253791333, 417351118269, 6197640479557, 31389717866283, 387573069042758

Offset

0,2

Links

Table of n, a(n) for n=0..27.

Crossrefs

Sequence in context: A323357 A322299 A003179 * A361440 A143590 A336030

Adjacent sequences: A153931 A153932 A153933 * A153935 A153936 A153937

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved