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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)).
2

%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