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

A370186

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

Terms

    a(0) =1a(1) =3a(2) =15a(3) =90a(4) =583a(5) =3913a(6) =26790a(7) =185839a(8) =1301575a(9) =9183681a(10) =65181645a(11) =464858661a(12) =3328503814a(13) =23913207750a(14) =172295708971

External references