Expansion of (1/(1 + x)) * Sum_{k>=1} k*x^k/(x^k + (1 + x)^k).

Terms

a(0) =1a(1) =-1a(2) =4a(3) =-13a(4) =36a(5) =-88a(6) =197a(7) =-421a(8) =895a(9) =-1946a(10) =4346a(11) =-9832a(12) =22140a(13) =-49043a(14) =106389a(15) =-226213a(16) =473366a(17) =-980413a(18) =2022418a(19) =-4179198a(20) =8687753a(21) =-18201140a(22) =38398455a(23) =-81343408a(24) =172383461a(25) =-364158198a(26) =764854519a(27) =-1595107695a(28) =3302884966a(29) =-6796646603