Constant term of the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).

A192465

Constant term of the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).

Terms

    a(0) =3a(1) =9a(2) =25a(3) =93a(4) =353a(5) =1389a(6) =5505a(7) =21933a(8) =87553a(9) =349869a(10) =1398785a(11) =5593773a(12) =22372353a(13) =89483949a(14) =357924865a(15) =1431677613a(16) =5726666753a(17) =22906579629a(18) =91626143745a(19) =366504225453

External references