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

A370286

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

Terms

    a(0) =1a(1) =3a(2) =17a(3) =102a(4) =645a(5) =4193a(6) =27764a(7) =186231a(8) =1261213a(9) =8604759a(10) =59053167a(11) =407217396a(12) =2819252544a(13) =19583729766a(14) =136426565999a(15) =952743556907

External references