147631domain: NAppears in sequencesa(n) = n^5 - n^4 + n^3 - n^2 + n.at n=11A191012Number of n-node rooted identity trees with thinning limbs and root outdegree (branching factor) 5.at n=14A245124a(n) = Sum_{k=1..n} sigma_2( (n/gcd(k,n))^2 ).at n=10A372996