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

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =10a(5) =27a(6) =31a(7) =37a(8) =38a(9) =102a(10) =110a(11) =126a(12) =219a(13) =245a(14) =309a(15) =389a(16) =474a(17) =648a(18) =653a(19) =719a(20) =979a(21) =4642a(22) =8745a(23) =17984a(24) =27374a(25) =33806a(26) =47578a(27) =63375a(28) =155060a(29) =214982