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Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with every one adjacent to exactly 2 other ones.
0

%I #3 Mar 31 2012 12:35:21

%S 1,1,2,3,5,12,33,97,381,1490,7757,42774,307960,2294754,22718581,

%T 231171797,3121763126,43651298703,807916379400,15440457456928,

%U 391605380566734,10243338678890245,355535039683009851

%N Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with every one adjacent to exactly 2 other ones.

%K nonn

%O 0,3

%A _R. H. Hardin_ Jan 04 2009