a(n) = Numerator of Bernoulli(n, 1) + 1/(n+1).

Terms

a(0) =2a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =7a(9) =1a(10) =1a(11) =1a(12) =-37a(13) =1a(14) =37a(15) =1a(16) =-211a(17) =1a(18) =2311a(19) =1a(20) =-407389a(21) =1a(22) =37153a(23) =1a(24) =-1181819909a(25) =1a(26) =76977929a(27) =1a(28) =-818946931a(29) =1