Triangle read by rows: T(n,k) = T(n-1,k-1) + n*T(n-2,k); T(0,0) = T(1,0) = T(1,1) = 1, T(n,k) = 0 if k>n or if k<0.
A230698
Triangle read by rows: T(n,k) = T(n-1,k-1) + n*T(n-2,k); T(0,0) = T(1,0) = T(1,1) = 1, T(n,k) = 0 if k>n or if k<0.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =3a(7) =5a(8) =1a(9) =1a(10) =8a(11) =7a(12) =9a(13) =1a(14) =1a(15) =15a(16) =33a(17) =12a(18) =14a(19) =1a(20) =1a(21) =48a(22) =57a(23) =87a(24) =18a(25) =20a(26) =1a(27) =1a(28) =105a(29) =279
External references
- oeis: A230698