Number of abundant numbers < 10^n.

Terms

a(0) =0a(1) =21a(2) =245a(3) =2487a(4) =24794a(5) =247544a(6) =2476736a(7) =24760667a(8) =247610954a(9) =2476238920a(10) =24761949212a(11) =247617948446