285311670621domain: NAppears in sequencesa(n) = n^n + n - 1.at n=11A231712a(n) = Sum_{k=1..n} gcd(n,k)^n.at n=10A332517a(n) = Sum_{k=1..n} gcd(k,n)^gcd(k,n).at n=10A342423a(n) = Sum_{k=1..n} gcd(k,n)^k.at n=10A342449