L.g.f.: log(Product_{k>=1} 1/(1 - x^k/(1 + x))) = Sum_{k>=1} a(k)*x^k/k.

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =-4a(5) =19a(6) =-27a(7) =61a(8) =-89a(9) =156a(10) =-230a(11) =383a(12) =-597a(13) =981a(14) =-1549a(15) =2493a(16) =-3943a(17) =6301a(18) =-10012a(19) =16020a(20) =-25626a(21) =41174a(22) =-66193a(23) =106639a(24) =-171829a(25) =277083a(26) =-446858a(27) =721033a(28) =-1163798a(29) =1879329