A153897 - OEIS

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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.

%I #5 Apr 28 2021 00:12:37

%S 1,2,2,6,10,38,84,462,1454,10978,47966,507832,3102956,45765610,

%T 389928206,8030198134,95507073248,2744133148026,45539464036516,

%U 1826082647001502,42290971759195390,2366417546297792380,76478152220819322380

%N 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.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009