Expansion of (1+x^3*C^4)*C^3, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
A071740
Expansion of (1+x^3*C^4)*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) =29a(4) =97a(5) =332a(6) =1155a(7) =4069a(8) =14482a(9) =51986a(10) =187986a(11) =684114a(12) =2503573a(13) =9207590a(14) =34013895a(15) =126153045a(16) =469574670a(17) =1753616370a(18) =6568462590a(19) =24670834470a(20) =92896573770a(21) =350612243904
External references
- oeis: A071740