A245416 Number of nonnegative integers with property that their base 9/2 expansion (see A024650) has n digits.

9, 36, 162, 729, 3276, 14742, 66339, 298530, 1343385, 6045228, 27203526, 122415867, 550871406, 2478921327, 11155145967, 50198156856, 225891705852, 1016512676334, 4574307043503, 20584381695759, 92629717630920, 416833729339140, 1875751782026130

Offset: 1

Author

James Van Alstine, Jul 21 2014

Keywords

• nonn
• base

Examples

			The numbers 9-44 are represented by 20, 21, 22, 23, 24, 25, 26, 27, 28, 40, 41, 42, 43, 44, 45, 46, 47, 48, 60, 61, 62, 63, 64, 65, 66, 67, 68, 80, 81, 82, 83, 84, 85, 86, 87, 88 respectively in base 9/2. These are the only integers with two digits, and so a(2)=36.
		

Crossrefs

Cf. A024650, A081848.

Programs

Sage

A=[1]
for i in [1..60]:
    A.append(ceil((9-2)/2*sum(A)))
[9*x for x in A]