a(n) = n*2^(n-1).

Terms

a(0) =0a(1) =1a(2) =4a(3) =12a(4) =32a(5) =80a(6) =192a(7) =448a(8) =1024a(9) =2304a(10) =5120a(11) =11264a(12) =24576a(13) =53248a(14) =114688a(15) =245760a(16) =524288a(17) =1114112a(18) =2359296a(19) =4980736a(20) =10485760a(21) =22020096a(22) =46137344a(23) =96468992a(24) =201326592a(25) =419430400a(26) =872415232a(27) =1811939328a(28) =3758096384a(29) =7784628224