Triangle read by rows: T(n,k) = n*T(n-1,k) + n - k starting at T(n,n)=0.

Terms

a(0) =0a(1) =1a(2) =0a(3) =4a(4) =1a(5) =0a(6) =15a(7) =5a(8) =1a(9) =0a(10) =64a(11) =23a(12) =6a(13) =1a(14) =0a(15) =325a(16) =119a(17) =33a(18) =7a(19) =1a(20) =0a(21) =1956a(22) =719a(23) =202a(24) =45a(25) =8a(26) =1a(27) =0a(28) =13699a(29) =5039