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

A071716

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

Terms

    a(0) =1a(1) =1a(2) =3a(3) =7a(4) =19a(5) =56a(6) =174a(7) =561a(8) =1859a(9) =6292a(10) =21658a(11) =75582a(12) =266798a(13) =950912a(14) =3417340a(15) =12369285a(16) =45052515a(17) =165002460a(18) =607283490a(19) =2244901890a(20) =8331383610a(21) =31030387440a(22) =115948830660a(23) =434542177290

External references