Expansion of (1+x^3*C^2)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

A071733

Expansion of (1+x^3*C^2)*C^4, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.

Terms

    a(0) =1a(1) =4a(2) =14a(3) =49a(4) =171a(5) =599a(6) =2112a(7) =7501a(8) =26832a(9) =96628a(10) =350132a(11) =1275850a(12) =4672841a(13) =17193765a(14) =63531060a(15) =235647765a(16) =877118340a(17) =3275236800a(18) =12266009940a(19) =46061604510a(20) =173404343190a(21) =654313080174

External references