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Search: id:A084872
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| A084872 |
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Number of 5-multiantichains of an n-set. |
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+0
1
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| 1, 2, 8, 56, 726, 17938, 722680, 35955180, 1798971434, 83885891894, 3612380896332, 145277787750064, 5534505187364062, 202229611397865690, 7158136006402746464, 247316732670273773108, 8389241054998193347410
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Goran Kilibarda and Vladeta Jovovic, Antichains of Multisets, J. Integer Seqs., Vol. 7, 2004.
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FORMULA
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1/5!*(32^n - 20*24^n+60*20^n+20*18^n+10*17^n - 90*16^n - 120*15^n+150*14^n+120*13^n - 480*12^n+20*11^n+720*10^n+120*9^n - 445*8^n+180*7^n - 1650*6^n+1650*5^n+870*4^n - 1740*3^n+744*2^n).
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CROSSREFS
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Cf. A016269, A047707, A051112-A051118, A084869-A084883.
Sequence in context: A128814 A108208 A135079 this_sequence A113725 A027335 A133686
Adjacent sequences: A084869 A084870 A084871 this_sequence A084873 A084874 A084875
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KEYWORD
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nonn
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AUTHOR
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Goran Kilibarda, Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 10 2003
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