Numerator of Bernoulli(2n)/(2n!).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =-1a(5) =1a(6) =-691a(7) =1a(8) =-3617a(9) =43867a(10) =-174611a(11) =77683a(12) =-236364091a(13) =657931a(14) =-3392780147a(17) =151628697551