A Fielder sequence: a(n) = a(n-1) + a(n-2) - a(n-6), n >= 7.

Terms

a(0) =0a(1) =2a(2) =3a(3) =6a(4) =10a(5) =11a(6) =21a(7) =30a(8) =48a(9) =72a(10) =110a(11) =171a(12) =260a(13) =401a(14) =613a(15) =942a(16) =1445a(17) =2216a(18) =3401a(19) =5216a(20) =8004a(21) =12278a(22) =18837a(23) =28899a(24) =44335a(25) =68018a(26) =104349a(27) =160089a(28) =245601a(29) =376791