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

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =4a(8) =5a(9) =7a(10) =10a(11) =14a(12) =19a(13) =26a(14) =36a(15) =50a(16) =69a(17) =95a(18) =131a(19) =181a(20) =250a(21) =345a(22) =476a(23) =657a(24) =907a(25) =1252a(26) =1728a(27) =2385a(28) =3292a(29) =4544