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

Terms

a(0) =0a(1) =1a(2) =1a(3) =11a(4) =13a(5) =57a(6) =15a(7) =247a(8) =251a(9) =1013a(10) =509a(11) =4083a(12) =4089a(13) =16369a(14) =2047a(15) =65519a(16) =65527a(17) =262125a(18) =131067a(19) =1048555a(20) =1048565a(21) =4194281a(22) =1048573a(23) =16777191a(24) =16777203a(25) =67108837a(26) =33554425a(27) =268435427a(28) =268435441a(29) =1073741793