a(n) = 5 * 2^n.

Terms

a(0) =5a(1) =10a(2) =20a(3) =40a(4) =80a(5) =160a(6) =320a(7) =640a(8) =1280a(9) =2560a(10) =5120a(11) =10240a(12) =20480a(13) =40960a(14) =81920a(15) =163840a(16) =327680a(17) =655360a(18) =1310720a(19) =2621440a(20) =5242880a(21) =10485760a(22) =20971520a(23) =41943040a(24) =83886080a(25) =167772160a(26) =335544320a(27) =671088640a(28) =1342177280a(29) =2684354560