791260251657domain: NAppears in sequencesa(n) = (7^n - 1)/6.at n=15A023000a(n) = (1/6) * (7^(n+1) - 3*(-1)^n + 2).at n=14A102303a(n) = Sum_{j=0..14} n^j.at n=7A104682a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 16.at n=6A161139