Numerator of Bernoulli(n, 2/7).

Terms

a(0) =1a(1) =-3a(2) =-11a(3) =15a(4) =599a(5) =-395a(6) =-3893a(7) =20855a(8) =1297199a(9) =-1869111a(10) =-315196855a(11) =255365275a(12) =304261665587a(13) =-49453295827