Series expansion of Farey rational polynomial based on A112627.

Terms

a(0) =1a(1) =5a(2) =23a(3) =81a(4) =367a(5) =1297a(6) =5871a(7) =20753a(8) =93935a(9) =332049a(10) =1502959a(11) =5312785a(12) =24047343a(13) =85004561a(14) =384757487a(15) =1360072977a(16) =6156119791a(17) =21761167633a(18) =98497916655a(19) =348178682129