Central terms of triangle A120914 (cascadence of (1+2x)^2).

A120917

Central terms of triangle A120914 (cascadence of (1+2x)^2).

Terms

    a(0) =1a(1) =4a(2) =32a(3) =212a(4) =1504a(5) =10848a(6) =79696a(7) =596160a(8) =4520000a(9) =34673940a(10) =268538048a(11) =2096374656a(12) =16475970896a(13) =130234435648

External references