a(n) = numerator of Sum_{k>=1} floor(n/k)/2^k.

Terms

a(0) =0a(1) =1a(2) =5a(3) =15a(4) =43a(5) =103a(6) =263a(7) =591a(8) =1391a(9) =3103a(10) =7007a(11) =15039a(12) =33983a(13) =72063a(14) =156543a(15) =334591a(16) =722687a(17) =1510911a(18) =3255807a(19) =6773759a(20) =14433279a(21) =30193663a(22) =63535103a(23) =131264511a(24) =278589439a(25) =575004671a(26) =1200349183a(27) =2484846591a(28) =5189910527a(29) =10648256511