A153898 Number of planar n X n X n binary triangular grids symmetric both under 120-degree rotation and reflection with no more than 1 one in any 2 X 2 X 2 subtriangle.

1, 2, 1, 2, 4, 4, 4, 20, 12, 32, 92, 128, 192, 1340, 1080, 3984, 16104, 31168, 66032, 644436, 720896, 3702816, 20885084, 56396000, 167145024, 2277052636, 3551548720, 25448231520, 200265789844, 754613710528, 3122443069456

Offset

0,2

Links

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

Crossrefs

Sequence in context: A360095 A350659 A094265 * A108802 A023673 A132965

Adjacent sequences: A153895 A153896 A153897 * A153899 A153900 A153901

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved