a(n) = A080247(2*n, n), the central values of the Big-Schröder triangle.

A330801

a(n) = A080247(2*n, n), the central values of the Big-Schröder triangle.

Terms

    a(0) =1a(1) =4a(2) =30a(3) =264a(4) =2490a(5) =24396a(6) =244790a(7) =2496528a(8) =25763058a(9) =268243860a(10) =2812481870a(11) =29653804824a(12) =314097641130

External references