a(n) is the denominator of 6 * Sum_{k=0..n} ((k+1)/(n-k+1)^2) * (Catalan(k)/(2^(2*k+1)))^2.
A280723
a(n) is the denominator of 6 * Sum_{k=0..n} ((k+1)/(n-k+1)^2) * (Catalan(k)/(2^(2*k+1)))^2.
Terms
- a(0) =2a(1) =16a(2) =384a(3) =6144a(4) =819200a(5) =19660800a(6) =7707033600a(7) =3288334336
External references
- oeis: A280723