The smallest amount which cannot be made with fewer than n British coins.

Terms

a(0) =1a(1) =3a(2) =8a(3) =18a(4) =38a(5) =88a(6) =188a(7) =388a(8) =588a(9) =788a(10) =988a(11) =1188a(12) =1388a(13) =1588a(14) =1788a(15) =1988a(16) =2188a(17) =2388a(18) =2588a(19) =2788a(20) =2988a(21) =3188a(22) =3388a(23) =3588a(24) =3788a(25) =3988a(26) =4188a(27) =4388a(28) =4588a(29) =4788