Shallit sequence S(3,13), a(n)=[ a(n-1)^2/a(n-2)+1 ].

Terms

a(0) =3a(1) =13a(2) =57a(3) =250a(4) =1097a(5) =4814a(6) =21126a(7) =92711a(8) =406861a(9) =1785505a(10) =7835669a(11) =34386747a(12) =150905861a(13) =662248712a(14) =2906271193a(15) =12754139184a(16) =55971399613a(17) =245629871954