Expansion of (1+x*C^4)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
A071715
Expansion of (1+x*C^4)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.
Terms
- a(0) =1a(1) =5a(2) =22a(3) =92a(4) =373a(5) =1482a(6) =5810a(7) =22576a(8) =87210a(9) =335597a(10) =1288276a(11) =4938100a(12) =18913245a(13) =72416190a(14) =277278570a(15) =1061970720a(16) =4069098750a(17) =15600014370a(18) =59845059924a(19) =229737429048a(20) =882572168450
External references
- oeis: A071715