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A243415
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Number of Dyck paths of semilength n having exactly 3 (possibly overlapping) occurrences of the consecutive steps UDUUDU (with U=(1,1), D=(1,-1)).
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2
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1, 9, 54, 279, 1334, 6092, 27048, 117896, 507173, 2160151, 9128266, 38326830, 160063712, 665442560, 2755685897, 11372798741, 46794914849, 192029181971, 786126469079, 3211253947191, 13091799706905, 53277016211285, 216451122516387, 878040805034630
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OFFSET
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8,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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