Expansion of F(x) where F(x) = 1 + x / (1 - x * F(x) * F(+x^2) ).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =12a(6) =31a(7) =81a(8) =219a(9) =599a(10) =1669a(11) =4698a(12) =13378a(13) =38414a(14) =111200a(15) =324026a(16) =949930a(17) =2799477a(18) =8289481a(19) =24649698a(20) =73580353a(21) =220402603a(22) =662285725a(23) =1995853152a(24) =6030654313a(25) =18266757996a(26) =55454844238a(27) =168704450182a(28) =514231352572