6140565047domain: NAppears in sequencesa(n) = (n^(n-1)-1)/(n-1)^2.at n=10A060073Arithmetic mean of row n in A112668.at n=10A110739Quotients ((p+1)^p - 1)/p^2 for p = prime(n).at n=4A137665Smallest k such that k*n^2 +1 is an n-th power.at n=10A193746