Sums of 9 distinct powers of 10.

Terms

a(0) =111111111a(1) =1011111111a(2) =1101111111a(3) =1110111111a(4) =1111011111a(5) =1111101111a(6) =1111110111a(7) =1111111011a(8) =1111111101a(9) =1111111110a(10) =10011111111a(11) =10101111111a(12) =10110111111a(13) =10111011111a(14) =10111101111a(15) =10111110111a(16) =10111111011