99471domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 4, 7, 8 and 9.at n=16A137058Number of nonnegative integer arrays of length 2n+5 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value n+1.at n=32A211850