Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^3)^2 )^n.

A370187

Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^3)^2 )^n.

Terms

    a(0) =1a(1) =4a(2) =28a(3) =226a(4) =1940a(5) =17214a(6) =155914a(7) =1432106a(8) =13289076a(9) =124276528a(10) =1169346298a(11) =11057293526a(12) =104986087178

External references