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

A071745

Expansion of (1+x^4*C)*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) =48a(4) =166a(5) =577a(6) =2022a(7) =7147a(8) =25469a(9) =91441a(10) =330516a(11) =1201900a(12) =4394415a(13) =16145630a(14) =59583202a(15) =220763545a(16) =820933365a(17) =3062860665a(18) =11462088180a(19) =43014021480a(20) =161834455920a(21) =610326088974

External references