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A262584
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a(n) = (A002704(n) - 2)/2.
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3
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0, 12, 468, 21399, 1065228, 55778796, 3020636340, 167544629316, 9461343754980, 541786421337804, 31372013730812823, 1833216802356228732, 107939805322734748116, 6396432908013911687436, 381139174656828902370420
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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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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EXTENSIONS
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STATUS
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approved
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