Denominator of Sum_{i=1..n} i/2^i.

Terms

a(0) =1a(1) =2a(2) =1a(3) =8a(4) =8a(5) =32a(6) =8a(7) =128a(8) =128a(9) =512a(10) =256a(11) =2048a(12) =2048a(13) =8192a(14) =1024a(15) =32768a(16) =32768a(17) =131072a(18) =65536a(19) =524288a(20) =524288a(21) =2097152a(22) =524288a(23) =8388608a(24) =8388608a(25) =33554432a(26) =16777216a(27) =134217728a(28) =134217728a(29) =536870912