Numerator of the n-th alternating harmonic number, Sum_{k=1..n} (-1)^(k+1)/k.

Terms

a(0) =1a(1) =1a(2) =5a(3) =7a(4) =47a(5) =37a(6) =319a(7) =533a(8) =1879a(9) =1627a(10) =20417a(11) =18107a(12) =263111a(13) =237371a(14) =52279a(15) =95549a(16) =1768477a(17) =1632341a(18) =33464927a(19) =155685007a(20) =166770367a(21) =156188887a(22) =3825136961a(23) =3602044091a(24) =19081066231a(25) =18051406831a(26) =57128792093a(27) =7751493599a(28) =236266661971