G.f.: Sum_{n>=0} (n+1) * x^n * (1 + x^n)^n / (1 + x^(n+1))^(n+2).

Terms

a(0) =1a(1) =0a(2) =8a(3) =-6a(4) =10a(5) =0a(6) =41a(7) =-64a(8) =48a(9) =0a(10) =82a(11) =-84a(12) =90a(13) =-300a(14) =532a(15) =-284a(16) =34a(17) =0a(18) =428a(19) =-892a(20) =671a(21) =-960a(22) =2620a(23) =-2440a(24) =1184a(25) =-1440a(26) =1408a(27) =-420a(28) =618a(29) =-3024