Triangle read by rows: T(n,k) is the number of Schroeder paths of semilength n containing exactly k peaks but no peaks at level one (n >= 1; 0 <= k <= n-1).

A126216

Triangle read by rows: T(n,k) is the number of Schroeder paths of semilength n containing exactly k peaks but no peaks at level one (n >= 1; 0 <= k <= n-1).

Terms

    a(0) =1a(1) =2a(2) =1a(3) =5a(4) =5a(5) =1a(6) =14a(7) =21a(8) =9a(9) =1a(10) =42a(11) =84a(12) =56a(13) =14a(14) =1a(15) =132a(16) =330a(17) =300a(18) =120a(19) =20a(20) =1a(21) =429a(22) =1287a(23) =1485a(24) =825a(25) =225a(26) =27a(27) =1a(28) =1430a(29) =5005

External references