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

A032952

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

Terms

    a(0) =1a(1) =3a(2) =11a(3) =41a(4) =152a(5) =561a(6) =2067a(7) =7618a(8) =28118a(9) =104006a(10) =385662a(11) =1433797a(12) =5344510a(13) =19973085a(14) =74827395a(15) =281000430a(16) =1057628550a(17) =3989213610a(18) =15077120010a(19) =57092280570a(20) =216579650664a(21) =822991216746

External references