1874730

Appears in sequences

• 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).at n=9A143388
• Indices of records in A353693.at n=34A353695