Expansion of (1+x^4*C^3)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
A071751
Expansion of (1+x^4*C^3)*C^2, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =14a(4) =43a(5) =137a(6) =449a(7) =1505a(8) =5137a(9) =17797a(10) =62426a(11) =221272a(12) =791350a(13) =2852090a(14) =10348597a(15) =37772095a(16) =138592365a(17) =510905325a(18) =1891325190a(19) =7028112300a(20) =26206236570a(21) =98023732590a(22) =367707496650
External references
- oeis: A071751