a(n) = Sum_{k=0..n} n^(n-k) * (n+k+1) * binomial(n,k) * binomial(n+k,k).
A331512
a(n) = Sum_{k=0..n} n^(n-k) * (n+k+1) * binomial(n,k) * binomial(n+k,k).
Terms
- a(0) =1a(1) =8a(2) =90a(3) =1328a(4) =24150a(5) =520272a(6) =12926004a(7) =363233600a(8) =11376760230a(9) =392615960600
External references
- oeis: A331512