248832363780domain: NAppears in sequencesde Bruijn's S(5,n) = Sum_{k = 0..2*n} (-1)^(n+k)*binomial(2*n, k)^5.at n=5A050984a(n) = Sum_{k=0..2*n} (-1)^(n+k) * binomial(2*n,k)^n.at n=5A350595