Central terms of the triangle in A199333: a(n) = A199333(2*n,n).

Terms

a(0) =1a(1) =2a(2) =7a(3) =29a(4) =107a(5) =431a(6) =1619a(7) =6079a(8) =22937a(9) =87083a(10) =332393a(11) =1273541a(12) =4896103a(13) =18877711a(14) =72968563a(15) =282664351a(16) =1097088989a(17) =4265342057a(18) =16608401041a(19) =64758466127a(20) =252814859149a(21) =988089813541