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

A370184

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

Terms

    a(0) =1a(1) =3a(2) =15a(3) =87a(4) =539a(5) =3458a(6) =22659a(7) =150594a(8) =1011131a(9) =6841779a(10) =46577430a(11) =318654900a(12) =2188931699a(13) =15087882943a(14) =104301302218a(15) =722840860787

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