Numerators of continued fraction convergents to sqrt(406).

Terms

a(0) =20a(1) =121a(2) =141a(3) =403a(4) =1753a(5) =12674a(6) =14427a(7) =70382a(8) =84809a(9) =664045a(10) =2740989a(11) =6146023a(12) =8887012a(13) =59468095a(14) =2387610812a(15) =14385132967a(16) =16772743779a(17) =47930620525a(18) =208495225879