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

A071742

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

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =44a(6) =137a(7) =443a(8) =1472a(9) =4994a(10) =17225a(11) =60216a(12) =212874a(13) =759696a(14) =2733226a(15) =9902857a(16) =36100570a(17) =132319230a(18) =487333545a(19) =1802620860a(20) =6693765210a(21) =24943905720a(22) =93249826830a(23) =349623734070

External references