G.f.: A(x) = (x-x^2) o x/(1-x) o (1-sqrt(1-4*x))/2, a composition of functions involving the Catalan function and its inverse.
A120009
G.f.: A(x) = (x-x^2) o x/(1-x) o (1-sqrt(1-4*x))/2, a composition of functions involving the Catalan function and its inverse.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-6a(5) =-33a(6) =-143a(7) =-572a(8) =-2210a(9) =-8398a(10) =-31654a(11) =-118864a(12) =-445740a(13) =-1671525a(14) =-6273135a(15) =-23571780a(16) =-88704330a(17) =-334347090a(18) =-1262330850a(19) =-4773905760a(20) =-18083762580a(21) =-68611922730a(22) =-260725306374a(23) =-992233959480
External references
- oeis: A120009