A Fielder sequence: a(n) = a(n-1) + a(n-2) + a(n-4).

Terms

a(0) =1a(1) =3a(2) =4a(3) =11a(4) =16a(5) =30a(6) =50a(7) =91a(8) =157a(9) =278a(10) =485a(11) =854a(12) =1496a(13) =2628a(14) =4609a(15) =8091a(16) =14196a(17) =24915a(18) =43720a(19) =76726a(20) =134642a(21) =236283a(22) =414645a(23) =727654a(24) =1276941a(25) =2240878a(26) =3932464a(27) =6900996a(28) =12110401a(29) =21252275