a(n) = 1 + Sum_{k=0..n-5} a(k) * a(n-k-5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =4a(8) =5a(9) =6a(10) =9a(11) =14a(12) =21a(13) =30a(14) =41a(15) =59a(16) =89a(17) =136a(18) =205a(19) =301a(20) =443a(21) =664a(22) =1011a(23) =1545a(24) =2341a(25) =3530a(26) =5341a(27) =8143a(28) =12487a(29) =19148