Triangle read by rows : T(n,0) = n+1, T(n,k)=0 if k<0 or if k>n, T(n,k) = k*T(n-1,k) - T(n-1,k-1).

Terms

a(0) =1a(1) =2a(2) =-1a(3) =3a(4) =-3a(5) =1a(6) =4a(7) =-6a(8) =5a(9) =-1a(10) =5a(11) =-10a(12) =16a(13) =-8a(14) =1a(15) =6a(16) =-15a(17) =42a(18) =-40a(19) =12a(20) =-1a(21) =7a(22) =-21a(23) =99a(24) =-162a(25) =88a(26) =-17a(27) =1a(28) =8a(29) =-28