Powers of 2 with initial digit 1.

Terms

a(0) =1a(1) =16a(2) =128a(3) =1024a(4) =16384a(5) =131072a(6) =1048576a(7) =16777216a(8) =134217728a(9) =1073741824a(10) =17179869184a(11) =137438953472