Norm of coefficients in g.f. C(x) that satisfies: C(x) = 1 + x/C(I*x).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =2a(6) =4a(7) =8a(8) =9a(9) =18a(10) =36a(11) =72a(12) =100a(13) =200a(14) =400a(15) =800a(16) =1225a(17) =2450a(18) =4900a(19) =9800a(20) =15876a(21) =31752a(22) =63504a(23) =127008a(24) =213444a(25) =426888a(26) =853776a(27) =1707552a(28) =2944656a(29) =5889312