%I A015086
%S A015086 1,1,6,161,20466,12833546,40130703276,627122621447281,
%T A015086 48995209411107768186,19138851672289046707772366,
%U A015086 37380607950584029444762130426196
%N A015086 q-Catalan numbers (recurrence version) for q=5.
%F A015086 a(n) = sum_{i=1}^{n-1} q^{(i-1)} a(i) a(n-i).
%Y A015086 Sequence in context: A128120 A030449 A120277 this_sequence A052466 A078535 
               A143534
%Y A015086 Adjacent sequences: A015083 A015084 A015085 this_sequence A015087 A015088 
               A015089
%K A015086 nonn
%O A015086 1,3
%A A015086 Olivier Gerard (olivier.gerard(AT)gmail.com)