Expansion of (1+x^4*C^2)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

A071749

Expansion of (1+x^4*C^2)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

Terms

    a(0) =1a(1) =4a(2) =14a(3) =48a(4) =166a(5) =578a(6) =2029a(7) =7182a(8) =25623a(9) =92078a(10) =333064a(11) =1211896a(12) =4433175a(13) =16294856a(14) =60155235a(15) =222950730a(16) =829284435a(17) =3094726590a(18) =11583668940a(19) =43478013360a(20) =163606061280a(21) =617094776844

External references