Numerator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).

Terms

a(0) =1a(1) =5a(2) =19a(3) =79a(4) =443a(5) =463a(6) =3481a(7) =14029a(8) =44327a(9) =9067a(10) =103769a(11) =104693a(12) =1405361a(13) =1425953a(14) =7321957a(15) =29332873a(16) =510190361a(17) =515635801a(18) =9993116059a(19) =10039674571a(20) =10217040331a(21) =10301692171a(22) =240663600893a(23) =241109786633