a(n) = 2*a(n-1) - 1 with a(0) = 10.

Terms

a(0) =10a(1) =19a(2) =37a(3) =73a(4) =145a(5) =289a(6) =577a(7) =1153a(8) =2305a(9) =4609a(10) =9217a(11) =18433a(12) =36865a(13) =73729a(14) =147457a(15) =294913a(16) =589825a(17) =1179649a(18) =2359297a(19) =4718593a(20) =9437185a(21) =18874369a(22) =37748737a(23) =75497473a(24) =150994945a(25) =301989889a(26) =603979777a(27) =1207959553a(28) =2415919105a(29) =4831838209