a(n) = Sum_{k=0..n} binomial(n-1,k-1)*binomial(2*k,k)*n!/(k + 1)!.
A317276
a(n) = Sum_{k=0..n} binomial(n-1,k-1)*binomial(2*k,k)*n!/(k + 1)!.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =23a(4) =170a(5) =1522a(6) =15912a(7) =189513a(8) =2525966a(9) =37176014a(10) =597852056a(11) =10417551806a(12) =195334043764
External references
- oeis: A317276