a(n) = Stirling2(2*n, n)*CatalanNumber(n).

A390277

a(n) = Stirling2(2*n, n)*CatalanNumber(n).

Terms

    a(0) =1a(1) =1a(2) =14a(3) =450a(4) =23814a(5) =1786050a(6) =174722064a(7) =21162261120

External references