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1, 1, 2, 6, 6, 30, 120, 720, 15120, 1164240, 15135120, 283931716867999200, 14510088480716327580681600, 3280681990411073806237542217555200, 936436634805345771521186435213604447980767985241556128000
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refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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COMMENTS
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For the convenience of the range notation above, we define A014137(-1) and A014138(-1) as zero.
This sequence grows so fast that it seems hopeless to count A057507 with Burnside's (orbit-counting) lemma.
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LINKS
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CROSSREFS
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Occurs for first time in A073204 as row 2614.
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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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