Numerators of continued fraction convergents to sqrt(409).

Terms

a(0) =20a(1) =81a(2) =182a(3) =1355a(4) =1537a(5) =2892a(6) =4429a(7) =20608a(8) =45645a(9) =111898a(10) =1500319a(11) =19616045a(12) =40732409a(13) =101080863a(14) =445055861a(15) =546136724a(16) =991192585a(17) =1537329309a(18) =11752497748a(19) =25042324805a(20) =111921796968