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

Terms

a(0) =2a(1) =5a(2) =10a(3) =21a(4) =43a(5) =86a(6) =173a(7) =347a(8) =695a(9) =1391a(10) =2783a(11) =5567a(12) =11134a(13) =22268a(14) =44536a(15) =89072a(16) =178145a(17) =356290a(18) =712581a(19) =1425162a(20) =2850325a(21) =5700650a(22) =11401300a(23) =22802600a(24) =45605201a(25) =91210402a(26) =182420805a(27) =364841611a(28) =729683222a(29) =1459366444