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Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 10 ones in any 5 X 5 X 5 subtriangle.
0

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

%S 1,2,2,4,8,12,23,90,162,611,2402,8560,32187,246141,874521,6300203,

%T 48576212,330649842,2414376086,35637800561,246608696517,3459350545304,

%U 51985154551969,691390369850685,9855466810408009,284813053880252248

%N Number of planar n X n X n binary triangular grids symmetric both under 120 degree rotation and reflection with no more than 10 ones in any 5 X 5 X 5 subtriangle.

%K nonn

%O 0,2

%A _R. H. Hardin_ Jan 04 2009