a(n) = floor(log(n)*2^n/n).

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =10a(5) =19a(6) =35a(7) =66a(8) =124a(9) =235a(10) =446a(11) =848a(12) =1616a(13) =3088a(14) =5915a(15) =11356a(16) =21844a(17) =42094a(18) =81249a(19) =157062a(20) =304039a(21) =589307a(22) =1143583a(23) =2221620a(24) =4320301a(25) =8409506a(26) =16383693a(27) =31945779a(28) =62338040a(29) =121733596