Constant term of the reduction by x^2->x+3 of the polynomial p(n,x)=1+x^n+x^(2n).

A192468

Constant term of the reduction by x^2->x+3 of the polynomial p(n,x)=1+x^n+x^(2n).

Terms

    a(0) =4a(1) =16a(2) =61a(3) =304a(4) =1546a(5) =8107a(6) =42748a(7) =226240a(8) =1198645a(9) =6353944a(10) =33688474a(11) =178631251a(12) =947215924a(13) =5022815920a(14) =26634734125a(15) =141237718720a(16) =748951245034

External references