Triangle read by rows: T(n,k) = T(n-1,k-1) + k^2*T(n-1,k), 1 < k <= n, T(n,1) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =21a(8) =14a(9) =1a(10) =1a(11) =85a(12) =147a(13) =30a(14) =1a(15) =1a(16) =341a(17) =1408a(18) =627a(19) =55a(20) =1a(21) =1a(22) =1365a(23) =13013a(24) =11440a(25) =2002a(26) =91a(27) =1a(28) =1a(29) =5461