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

A370160

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

Terms

    a(0) =1a(1) =4a(2) =32a(3) =286a(4) =2688a(5) =26004a(6) =256322a(7) =2559960a(8) =25816576a(9) =262307824a(10) =2681024032a(11) =27534988936a(12) =283926200706

External references