Smallest number requiring n 1's to build using +, * and -.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =10a(7) =11a(8) =17a(9) =22a(10) =29a(11) =41a(12) =58a(13) =67a(14) =101a(15) =131a(16) =173a(17) =262a(18) =346a(19) =461a(20) =617a(21) =787a(22) =1123a(23) =1571a(24) =2077a(25) =2767a(26) =4153a(27) =5443a(28) =7963a(29) =10733