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%I #5 Dec 18 2015 18:17:46
%S 1,1,11,671,401565,2106810049,103074513713971,47878816111749257161
%N Number of lower triangles of an n X n -5..5 array with all row and column sums zero
%C Column 5 of A195522
%e Some solutions for n=4
%e ..0........0........0........0........0........0........0........0
%e ..2-2......5-5......4-4......0.0......5-5.....-2.2......0.0.....-5.5
%e .-4.4.0...-1.3-2...-5.4.1...-1.2-1...-1.3-2....4.0-4...-1.4-3....3-5.2
%e ..2-2.0.0.-4.2.2.0..1.0-1.0..1-2.1.0.-4.2.2.0.-2-2.4.0..1-4.3.0..2.0-2.0
%K nonn
%O 1,3
%A _R. H. Hardin_ Sep 20 2011
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