From George Gilbert's marks problem: jumping 5 marks at a time (initial positions).

Terms

a(0) =1a(1) =2a(2) =6a(3) =74a(4) =76a(5) =479a(6) =658a(7) =749a(8) =1029a(9) =1722a(10) =3693a(11) =5431a(12) =17081a(13) =26611a(14) =89702a(15) =93902a(16) =132726a(17) =140759a(18) =144429a(19) =154292a(20) =928663a(21) =1178463a(22) =1625140a(23) =2053165a(24) =2690949a(25) =2935639a(26) =3643165a(27) =8402288a(28) =11566624a(29) =11599521