Coefficient of x in the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).
A192466
Coefficient of x in the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).
Terms
- a(0) =2a(1) =6a(2) =24a(3) =90a(4) =352a(5) =1386a(6) =5504a(7) =21930a(8) =87552a(9) =349866a(10) =1398784a(11) =5593770a(12) =22372352a(13) =89483946a(14) =357924864a(15) =1431677610a(16) =5726666752a(17) =22906579626a(18) =91626143744a(19) =366504225450
External references
- oeis: A192466