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%I #4 Jun 04 2014 18:16:19
%S 1,11,79,474,2561,12937,62524,293146,1344602,6065734,27007870,
%T 118984043,519589872,2252141576,9699519424,41541816291,177048628294,
%U 751293699026,3175665502731,13376228005419,56162636663430,235124074987923,981718571224412,4088916793922566
%N Number of Dyck paths of semilength n having exactly 4 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
%H Alois P. Heinz, <a href="/A243416/b243416.txt">Table of n, a(n) for n = 10..550</a>
%Y Column k=4 of A243366.
%K nonn
%O 10,2
%A _Alois P. Heinz_, Jun 04 2014
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