Numerators of continued fraction convergents to sqrt(180).

Terms

a(0) =13a(1) =27a(2) =67a(3) =161a(4) =4253a(5) =8667a(6) =21587a(7) =51841a(8) =1369453a(9) =2790747a(10) =6950947a(11) =16692641a(12) =440959613a(13) =898611867a(14) =2238183347a(15) =5374978561a(16) =141987625933a(17) =289350230427a(18) =720688086787