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A340813
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Number of oriented polygonal 2-trees with n oriented quadrilaterals.
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2
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1, 1, 1, 3, 11, 49, 252, 1406, 8405, 52348, 337029, 2225333, 15002763, 102896407, 716106077, 5046649182, 35956186581, 258649116963, 1876462272125, 13717081730294, 100957850485311, 747631534534529, 5567459642741752, 41671027665802639, 313351688709886964, 2366390596263188755
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OFFSET
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0,4
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LINKS
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PROG
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(PARI) C(25, 4) \\ See A340812 for C(n, k).
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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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