A153898 - OEIS

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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.

%I #8 Feb 25 2023 18:07:00

%S 1,2,1,2,4,4,4,20,12,32,92,128,192,1340,1080,3984,16104,31168,66032,

%T 644436,720896,3702816,20885084,56396000,167145024,2277052636,

%U 3551548720,25448231520,200265789844,754613710528,3122443069456

%N 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.

%K nonn

%O 0,2

%A _R. H. Hardin_, Jan 03 2009