a(n) = Sum_{k=0..n} A033184(n,k)*A033184(n,n-k), where Catalan triangle entry A033184(n,k) = C(2*n-k,n-k)*(k+1)/(n+1).

A143388

a(n) = Sum_{k=0..n} A033184(n,k)*A033184(n,n-k), where Catalan triangle entry A033184(n,k) = C(2*n-k,n-k)*(k+1)/(n+1).

Terms

    a(0) =1a(1) =2a(2) =8a(3) =40a(4) =221a(5) =1288a(6) =7752a(7) =47652a(8) =297275a(9) =1874730a(10) =11920740a(11) =76292736a(12) =490828828a(13) =3171317360a(14) =20563942288a(15) =133749903324a(16) =872196460359

External references