Numerators of power series for sqrt(1+x^2)/sqrt(1-x).

Terms

a(0) =1a(1) =1a(2) =7a(3) =9a(4) =43a(5) =87a(6) =387a(7) =665a(8) =8499a(9) =17003a(10) =72345a(11) =131903a(12) =913919a(13) =1825875a(14) =7629371a(15) =14275257a(16) =410980675a(17) =820899123a(18) =3396389533a(19) =6448133283a(20) =47448015653a(21) =94775447369a(22) =389689995525a(23) =746772134927