T(n,n), array T as in A047150.

Terms

a(0) =1a(1) =2a(2) =4a(3) =14a(4) =44a(5) =158a(6) =582a(7) =2068a(8) =7658a(9) =28365a(10) =106688a(11) =405144a(12) =1537720a(13) =5870813a(14) =22477625a(15) =86391408a(16) =333202409a(17) =1287571951a(18) =4986174232a(19) =19342971327a(20) =75166542530a(21) =292574047008