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A246574
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a(n) = 2*(n-1)*Catalan(n).
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2
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0, 4, 20, 84, 336, 1320, 5148, 20020, 77792, 302328, 1175720, 4576264, 17829600, 69535440, 271455660, 1060730100, 4148633280, 16239715800, 63621474840, 249436575960, 978650680800, 3842267672880, 15094623000600, 59335590776904, 233373427269696
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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PROG
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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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