a(n) = (A083108(n) - 1)/n.

Terms

a(0) =0a(1) =1a(2) =3a(3) =26a(4) =43a(5) =15849a(6) =1337a(7) =253378a(8) =355911a(9) =568304837a(10) =6927709a(12) =921156923