Expansion of 1/(1-3*x)^7; 7-fold convolution of A000244 (powers of 3).

A036220

Expansion of 1/(1-3*x)^7; 7-fold convolution of A000244 (powers of 3).

Terms

    a(0) =1a(1) =21a(2) =252a(3) =2268a(4) =17010a(5) =112266a(6) =673596a(7) =3752892a(8) =19702683a(9) =98513415a(10) =472864392a(11) =2192371272a(12) =9865670724a(13) =43257171636a(14) =185387878440a(15) =778629089448

External references