Denominators of u(n) where u(n) = (u(n-1) + u(n-2)) / u(n-3), with u(1) = u(2) = u(3) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =10a(10) =6a(11) =21a(12) =77a(13) =55a(14) =145a(15) =899a(16) =868a(17) =1988a(18) =38411a(19) =90347a(20) =95357a(21) =637807a(22) =3506263a(23) =2382501a(24) =19519203a(25) =649945741a(26) =911672929a(27) =3857971277a(28) =130630182325a(29) =366719420575