Main diagonal of triangle A120919 (cascadence of (1+x)^3); a(n) = A120919(n,n) for n>=0.

A120922

Main diagonal of triangle A120919 (cascadence of (1+x)^3); a(n) = A120919(n,n) for n>=0.

Terms

    a(0) =1a(1) =3a(2) =18a(3) =128a(4) =876a(5) =6138a(6) =43373a(7) =307857a(8) =2194731a(9) =15698743a(10) =112614054a(11) =809905638a(12) =5838361138a(13) =42178611879a(14) =305340946455

External references