A153897 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 1 one in any 2 X 2 X 2 subtriangle.

1, 2, 2, 6, 10, 38, 84, 462, 1454, 10978, 47966, 507832, 3102956, 45765610, 389928206, 8030198134, 95507073248, 2744133148026, 45539464036516, 1826082647001502, 42290971759195390, 2366417546297792380, 76478152220819322380

Offset

0,2

Links

Table of n, a(n) for n=0..22.

Crossrefs

Sequence in context: A265987 A076907 A260785 * A103774 A036052 A355207

Adjacent sequences: A153894 A153895 A153896 * A153898 A153899 A153900

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved