73480domain: NAppears in sequencesTriangular array T(n,k) giving number of weakly connected digraphs with n labeled nodes and k arcs (n >= 1, 0 <= k <= n(n-1)).at n=31A062735Number of 5-step S, E, and NW-moving king's tours on an n X n board summed over all starting positions.at n=39A187510a(n) = (1/3)*A290906(n).at n=10A290907