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

Terms

a(0) =1a(1) =-1a(2) =7a(3) =-13a(4) =36a(5) =-67a(6) =141a(7) =-269a(8) =547a(9) =-1076a(10) =2146a(11) =-4231a(12) =8399a(13) =-16661a(14) =33177a(15) =-66109a(16) =131921a(17) =-263353a(18) =526054a(19) =-1051108a(20) =2100840a(21) =-4199614a(22) =8396289a(23) =-16788239a(24) =33570311a(25) =-67131715a(26) =134250784a(27) =-268483361a(28) =536940598a(29) =-1073843297