Triangular array read by rows associated with Schroeder numbers: T(1,k) = 1; T(n,k) = 0 if k < n; T(n,k) = T(n,k-1) + T(n-1,k-1) + T(n-1,k).

A033877

Triangular array read by rows associated with Schroeder numbers: T(1,k) = 1; T(n,k) = 0 if k < n; T(n,k) = T(n,k-1) + T(n-1,k-1) + T(n-1,k).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =1a(4) =4a(5) =6a(6) =1a(7) =6a(8) =16a(9) =22a(10) =1a(11) =8a(12) =30a(13) =68a(14) =90a(15) =1a(16) =10a(17) =48a(18) =146a(19) =304a(20) =394a(21) =1a(22) =12a(23) =70a(24) =264a(25) =714a(26) =1412a(27) =1806a(28) =1a(29) =14

External references