Triangle of Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle.

A001263

Triangle of Narayana numbers T(n,k) = C(n-1,k-1)*C(n,k-1)/k with 1 <= k <= n, read by rows. Also called the Catalan triangle.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =6a(8) =6a(9) =1a(10) =1a(11) =10a(12) =20a(13) =10a(14) =1a(15) =1a(16) =15a(17) =50a(18) =50a(19) =15a(20) =1a(21) =1a(22) =21a(23) =105a(24) =175a(25) =105a(26) =21a(27) =1a(28) =1a(29) =28

External references