165125domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 2, 5, 6 and 7.at n=57A137004Total number of nodes summed over all lattice paths from (0,0) to (i,n-2*i) that do not go above the diagonal x=y using steps in {(1,0), (0,1)}.at n=26A357655