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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. 0
1, 2, 2, 6, 10, 38, 84, 462, 1454, 10978, 47966, 507832, 3102956, 45765610, 389928206, 8030198134, 95507073248, 2744133148026, 45539464036516, 1826082647001502, 42290971759195390, 2366417546297792380, 76478152220819322380 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A265987 A076907 A260785 * A103774 A036052 A308260

Adjacent sequences:  A153894 A153895 A153896 * A153898 A153899 A153900

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2009

STATUS

approved

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Last modified April 9 10:32 EDT 2020. Contains 333348 sequences. (Running on oeis4.)