Autosequence preceding A198631(n)/A006519(n+1). Numerators.

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =3a(5) =5a(6) =5a(7) =7a(8) =7a(9) =-3a(10) =-3a(11) =121a(12) =121a(13) =-1261a(14) =-1261a(15) =20583a(16) =20583a(17) =-888403a(18) =-888403a(19) =24729925a(20) =24729925a(21) =-862992399a(22) =-862992399a(23) =36913939769a(24) =36913939769