52915domain: NAppears in sequencesNumbers k such that k and k^2 use only the digits 1, 2, 5, 7 and 9.at n=15A137009Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 01010-11111-00100 pattern in any orientation.at n=13A147349Expansion of e.g.f.: exp(x)*(exp(x)-1)*(exp(x)-x).at n=10A360586