Expansion of (1+x^4*C^3)*C^3, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
A071752
Expansion of (1+x^4*C^3)*C^3, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =28a(4) =91a(5) =303a(6) =1028a(7) =3542a(8) =12363a(9) =43628a(10) =155414a(11) =558144a(12) =2018750a(13) =7347281a(14) =26888610a(15) =98888730a(16) =365292555a(17) =1354757040a(18) =5042499990a(19) =18830130360a(20) =70527871530a(21) =264886906830a(22) =997372693824
External references
- oeis: A071752