A153993 Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 10 ones in any 5 X 5 X 5 subtriangle.

1, 2, 2, 4, 8, 12, 23, 90, 162, 611, 2402, 8560, 32187, 246141, 874521, 6300203, 48576212, 330649842, 2414376086, 35637800561, 246608696517, 3459350545304, 51985154551969, 691390369850685, 9855466810408009, 284813053880252248

Offset

0,2

Links

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

Crossrefs

Sequence in context: A078044 A348851 A329664 * A244781 A052907 A048114

Adjacent sequences: A153990 A153991 A153992 * A153994 A153995 A153996

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved