Triangular recursive sequence: a(n,k)=(n - k + 1)A(n - 1, k - 1) + (k)* A(n - 1, k) - 18*A(n - 2, k - 1).

A153489

Triangular recursive sequence: a(n,k)=(n - k + 1)A(n - 1, k - 1) + (k)* A(n - 1, k) - 18*A(n - 2, k - 1).

Terms

    a(0) =2a(1) =3a(2) =3a(3) =2a(4) =14a(5) =2a(6) =2a(7) =25a(8) =25a(9) =2a(10) =2a(11) =49a(12) =60a(13) =49a(14) =2a(15) =2a(16) =115a(17) =126a(18) =126a(19) =115a(20) =2a(21) =2a(22) =217a(23) =253a(24) =514a(25) =253a(26) =217a(27) =2a(28) =2a(29) =415

External references