a(n)=Floor(n*2^(n/2)).

Terms

a(0) =1a(1) =4a(2) =8a(3) =16a(4) =28a(5) =48a(6) =79a(7) =128a(8) =203a(9) =320a(10) =497a(11) =768a(12) =1176a(13) =1792a(14) =2715a(15) =4096a(16) =6154a(17) =9216a(18) =13757a(19) =20480a(20) =30411a(21) =45056a(22) =66615a(23) =98304a(24) =144815a(25) =212992a(26) =312801a(27) =458752a(28) =671943a(29) =983040