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A192105
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Number of distinct (unordered) pairs of partitions of a 12-element set that have Rand distance n.
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0
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7654350, 40209840, 156637140, 576841320, 1851589872, 5544758076, 14686598520, 35723706480, 75818872580, 144536922420, 242305860072, 370664737190, 506699655660, 643405035240, 746030515164, 812426918688, 833352979140, 795923308950, 741556189440, 644098507272, 547387431756, 444670121610, 349922192400, 268690544925, 197063378424, 147497181678, 99290917440, 73672276095, 45746253960, 32550841950, 19313040780
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OFFSET
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1,1
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COMMENTS
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The Rand distance of a pair of set partitions is the number of unordered pairs {x; y} such that there is a block in one partition containing both x and y, but x and y are in different blocks in the other partition.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,fini
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AUTHOR
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Frank Ruskey and Yuji Yamauchi (eugene.uti(AT)gmail.com), Aug 08 2011
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STATUS
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approved
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