a(n) = a(n-2)+a(n-3)+a(n-4)+a(n-5)+2*a(n-6)+a(n-7).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =7a(8) =7a(9) =13a(10) =19a(11) =31a(12) =49a(13) =85a(14) =133a(15) =217a(16) =349a(17) =565a(18) =913a(19) =1483a(20) =2395a(21) =3877a(22) =6271a(23) =10147a(24) =16417a(25) =26569a(26) =42985a(27) =69553a(28) =112537a(29) =182089