94036996914domain: NAppears in sequencesa(n) = Sum_{j=1..n} phi(n)^j.at n=13A075490a(0)=0; a(n) = 6*a(n-1) + 6.at n=14A105281a(n) = Sum_{k=1..A124259(n)} n^k.at n=5A124260