a(n) = Sum_{k=0..n} A000108(k)*A001263(n+1,k+1), where A000108 is the Catalan numbers and A001263 is the Narayana triangle.
A128088
a(n) = Sum_{k=0..n} A000108(k)*A001263(n+1,k+1), where A000108 is the Catalan numbers and A001263 is the Narayana triangle.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =24a(4) =115a(5) =618a(6) =3591a(7) =22088a(8) =141903a(9) =943590a(10) =6452490a(11) =45159480a(12) =322305165a(13) =2339100078a(14) =17223121350a(15) =128428689888a(16) =968383277791
External references
- oeis: A128088