Expansion of c(2*x^2)/(1-x*c(2*x^2)), where c(x) = (1-sqrt(1-4*x))/(2*x) is the g.f. of the Catalan numbers (A000108).
A126087
Expansion of c(2*x^2)/(1-x*c(2*x^2)), where c(x) = (1-sqrt(1-4*x))/(2*x) is the g.f. of the Catalan numbers (A000108).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =15a(5) =29a(6) =87a(7) =181a(8) =543a(9) =1181a(10) =3543a(11) =7941a(12) =23823a(13) =54573a(14) =163719a(15) =381333a(16) =1143999a(17) =2699837a(18) =8099511a(19) =19319845a(20) =57959535a(21) =139480397a(22) =418441191a(23) =1014536117a(24) =3043608351a(25) =7426790749a(26) =22280372247a(27) =54669443141a(28) =164008329423
External references
- oeis: A126087