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Search: id:A084871
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| A084871 |
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Number of 4-multiantichains of an n-set. |
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+0
1
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| 1, 2, 7, 41, 398, 6177, 128232, 2881531, 62769238, 1288737197, 25012685732, 463681018671, 8294783320578, 144410750517217, 2462999084589232, 41359616334934211, 686406989350511918, 11290725888842193237
(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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1/4!*(16^n - 12*12^n+24*10^n+4*9^n - 6*8^n+6*7^n - 108*6^n+108*5^n+83*4^n - 166*3^n+90*2^n).
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CROSSREFS
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Cf. A016269, A047707, A051112-A051118, A084869-A084883.
Adjacent sequences: A084868 A084869 A084870 this_sequence A084872 A084873 A084874
Sequence in context: A006846 A047864 A008934 this_sequence A122942 A109172 A131682
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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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