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

Terms

a(0) =0a(1) =2a(2) =8a(3) =22a(4) =51a(5) =114a(6) =249a(7) =532a(8) =1124a(9) =2357a(10) =4910a(11) =10178a(12) =21012a(13) =43238a(14) =88737a(15) =181704a(16) =371354a(17) =757693a(18) =1543734a(19) =3141252a(20) =6384826a(21) =12964771a(22) =26302431a(23) =53318895a(24) =108007549a(25) =218647157a(26) =442359736a(27) =894481837a(28) =1807803183a(29) =3652007880