Second term in continued fraction for zeta(n).

Terms

a(0) =1a(1) =4a(2) =12a(3) =27a(4) =57a(5) =119a(6) =245a(7) =497a(8) =1005a(9) =2023a(10) =4063a(11) =8149a(12) =16327a(13) =32692a(14) =65435a(15) =130938a(16) =261965a(17) =524050a(18) =1048259a(19) =2096730a(20) =4193742a(21) =8387859a(22) =16776218a(23) =33553102a(24) =67107091a(25) =134215364a(26) =268432305a(27) =536866711a(28) =1073736223a(29) =2147476180