66709domain: NAppears in sequencesNumber of 7-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=14A187381Numbers m such that m^2 divides 2^k - 1 for some k, 0 < k <= m.at n=28A246503Numbers k such that 2^(2^k-2) == 1 (mod k^2) and 2^(k-1) =/= 1 (mod k).at n=0A374953