Number of ascents in all Schroeder paths of length 2n.

Terms

a(0) =0a(1) =1a(2) =6a(3) =32a(4) =170a(5) =912a(6) =4942a(7) =27008a(8) =148626a(9) =822560a(10) =4573910a(11) =25534368a(12) =143027898a(13) =803467056a(14) =4524812190a(15) =25537728000a(16) =144411206178a(17) =818017823808