75226domain: NAppears in sequencesa(n) = floor(1/(n-1) * Sum_{k=1..n-1} a(k)^(n/k)), given a(0)=1, a(1)=2, a(2)=3.at n=18A079116Number of 6-step E, S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=12A187589