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

A070859

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

Terms

    a(0) =1a(1) =2a(2) =7a(3) =25a(4) =89a(5) =317a(6) =1133a(7) =4069a(8) =14690a(9) =53312a(10) =194446a(11) =712538a(12) =2622437a(13) =9690475a(14) =35941065a(15) =133756845a(16) =499349550a(17) =1869614340a(18) =7018807650a(19) =26415146190a(20) =99642310170a(21) =376674137034

External references