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A270962
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Number of set partitions of [n] having exactly eight pairs (m,m+1) such that m+1 is in some block b and m is in block b+1.
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2
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15, 857, 21129, 361154, 5138182, 66407157, 816411988, 9796844472, 116493895521, 1385342513224, 16571907424860, 200166968890873, 2447436683633895, 30343738969483443, 381914993014556712, 4883614045607479339, 63476602847240143719, 838919983940694715522
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OFFSET
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13,1
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LINKS
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EXAMPLE
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a(13) = 15: 1369(13)|258(12)|47(11)|(10), 136(10)(13)|259(12)|48(11)|7, 136(10)|259(13)|48(12)|7(11), 136(10)|259|48(13)|7(12)|(11), 136(13)|259(12)|48(11)|7(10), 136|259(13)|48(12)|7(11)|(10), 136(13)|25(12)|48(11)|7(10)|9, 139(13)|258(12)|47(11)|6(10), 139|258(13)|47(12)|6(11)|(10), 13(13)|258(12)|47(11)|6(10)|9, 138(13)|27(12)|46(11)|5(10)|9, 159(13)|248(12)|37(11)|6(10), 159|248(13)|37(12)|6(11)|(10), 15(13)|248(12)|37(11)|6(10)|9, 18(13)|247(12)|36(11)|5(10)|9.
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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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