Triangle read by rows where T(n+1,k)=T(n,k)+n*T(n-1,k) starting with T(n,n)=1 and T(n,k)=0 if n<k.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =4a(7) =3a(8) =1a(9) =1a(10) =10a(11) =6a(12) =4a(13) =1a(14) =1a(15) =26a(16) =18a(17) =8a(18) =5a(19) =1a(20) =1a(21) =76a(22) =48a(23) =28a(24) =10a(25) =6a(26) =1a(27) =1a(28) =232a(29) =156