Numerator of Bernoulli(n, -1/2).

Terms

a(0) =1a(1) =-1a(2) =11a(3) =-3a(4) =127a(5) =-5a(6) =221a(7) =-7a(8) =367a(9) =-9a(10) =-1895a(11) =-11a(12) =1447237a(13) =-13a(14) =-57253a(15) =-15a(16) =118526399a(17) =-17a(18) =-5749677193a(19) =-19a(20) =91546283957a(21) =-21a(23) =-23a(25) =-25a(27) =-27a(29) =-29a(31) =-31