From George Gilbert's marks problem: jumping 6 marks at a time (final positions).

Terms

a(0) =2a(1) =24a(2) =39a(3) =104a(4) =388a(5) =578a(6) =669a(7) =2746a(8) =2819a(9) =3013a(10) =5169a(11) =17398a(12) =19094a(13) =21359a(14) =23116a(15) =24950a(16) =48267a(17) =48487a(18) =105621a(19) =215513a(20) =4706574a(21) =16400064a(22) =106043719a(23) =137338247a(24) =243888200a(25) =478287113a(26) =673135223a(27) =3077440133a(28) =6453969104