a(n) = a(n-1) + a(n-2) - a(n-3) + a(n-4) + a(n-5), with a(0)=a(1)=a(2)=1, a(3)=-1 and a(4)=1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-1a(4) =1a(5) =1a(6) =5a(7) =5a(8) =9a(9) =11a(10) =21a(11) =33a(12) =57a(13) =89a(14) =145a(15) =231a(16) =377a(17) =609a(18) =989a(19) =1597a(20) =2585a(21) =4179a(22) =6765a(23) =10945a(24) =17713a(25) =28657a(26) =46369a(27) =75023a(28) =121393a(29) =196417