%I #4 Jun 04 2014 17:58:57
%S 1,21,279,2914,25771,201454,1433041,9469739,59016909,350829247,
%T 2006522229,11114963598,59942608977,316006164419,1633786190804,
%U 8305527032158,41603804525306,205707814621939,1005426524364506,4863626362504773,23309223454202475,110773290856066906
%N Number of Dyck paths of semilength n having exactly 9 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
%H Alois P. Heinz, <a href="/A243421/b243421.txt">Table of n, a(n) for n = 20..550</a>
%Y Column k=9 of A243366.
%K nonn
%O 20,2
%A _Alois P. Heinz_, Jun 04 2014