%I #10 Jul 22 2014 12:35:12
%S 5,10,25,60,150,375,940,2350,5875,14685,36715,91785,229465,573660,
%T 1434150,3585375,8963440,22408600,56021500,140053750,350134375,
%U 875335935,2188339840,5470849600,13677124000,34192810000,85482025000,213705062500,534262656250
%N Number of nonnegative integers with property that their base 5/2 expansion (see A024632) has n digits.
%e a(2) = 10 because 20, 21, 22, 23, 24, 40, 41, 42, 43 and 44 are the base 5/2 expansions for the integers 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14 respectively and these are the only integers with 2 digits.
%o (Sage)
%o A=[1]
%o for i in [1..60]:
%o A.append(ceil(((5-2)/2)*sum(A)))
%o [5*x for x in A]
%Y Cf. A081848, A245356, A024632.
%K nonn,base
%O 1,1
%A _Hailey R. Olafson_, Jul 21 2014