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Let be the matrix A= [ \ t1 t2 t3 t4 ... t(n-3) t(n-2) t(n-1) tn ] [ t1 \ t2 t3 t4 ... t(n-3) t(n-2) t(n-1) tn ] [ t1 t2 \ t3 t4 ... t(n-3) t(n-2) t(n-1) tn ] [ t1 t2 t3 \ t4...

Let be K(n)=all the numbers obtained with the conditions of your problem. ***If n=1 then k(n)=1 1 ***If n=2 then k(n)=3 11 12 22 ***If n=3 then k(n)=10 111 112 113 122 123 133 222 223 233 333 ***If n=4 then k(n)=35 1111 1112 1113 1114 1122 1123 1124 1133...