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

A071757

Expansion of (1+x^4*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) =4a(2) =14a(3) =48a(4) =166a(5) =580a(6) =2046a(7) =7280a(8) =26104a(9) =94248a(10) =342380a(11) =1250656a(12) =4591122a(13) =16929380a(14) =62678910a(15) =232916400a(16) =868434000a(17) =3247943160a(18) =12181647780a(19) =45807142560a(20) =172664906700a(21) =652291953768

External references