Floor( e * (3/2)^n ).

Terms

a(0) =2a(1) =4a(2) =6a(3) =9a(4) =13a(5) =20a(6) =30a(7) =46a(8) =69a(9) =104a(10) =156a(11) =235a(12) =352a(13) =529a(14) =793a(15) =1190a(16) =1785a(17) =2678a(18) =4017a(19) =6025a(20) =9038a(21) =13558a(22) =20337a(23) =30506a(24) =45759a(25) =68639a(26) =102959a(27) =154439a(28) =231659a(29) =347488