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

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =17a(6) =42a(7) =118a(8) =321a(9) =920a(10) =2626a(11) =7679a(12) =22554a(13) =67115a(14) =200883a(15) =606238a(16) =1839448a(17) =5613892a(18) =17211963a(19) =53006846a(20) =163866246a(21) =508389780a(22) =1582286912a(23) =4939146731a(24) =15459006948a(25) =48505063741a(26) =152539740067a(27) =480726546083