From George Gilbert's marks problem: jumping 7 marks at a time (initial positions).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =8a(6) =10a(7) =17a(8) =25a(9) =88a(10) =102a(11) =108a(12) =148a(13) =194a(14) =205a(15) =548a(16) =640a(17) =746a(18) =2135a(19) =3658a(20) =5689a(21) =12200a(22) =16992a(23) =17460a(24) =38961a(25) =44699a(26) =85493a(27) =138435a(28) =256776a(29) =810597