a(n) = 3*a(n-1) - 2*a(n-2) - a(n-4) + a(n-5) with initial terms 1, 1, 1, 3, 6.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =12a(6) =24a(7) =46a(8) =87a(9) =163a(10) =303a(11) =561a(12) =1036a(13) =1910a(14) =3518a(15) =6476a(16) =11917a(17) =21925a(18) =40333a(19) =74191a(20) =136466a(21) =251008a(22) =461684a(23) =849178a(24) =1561891a(25) =2872775a(26) =5283867a(27) =9718557a(28) =17875224a(29) =32877674