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Search: id:A006361
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| A006361 |
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Antichains (or order ideals) in the poset 2*2*4*n or size of the distributive lattice J(2*2*4*n)
(Formerly M5370)
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+0
9
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| 1, 105, 3490, 59542, 650644, 5157098, 32046856, 164489084, 723509159, 2801747767, 9748942554, 30967306114, 90930233726, 249319296218, 643622467414, 1575086681342, 3675063064675, 8215220917795
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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J. Berman and P. Koehler, Cardinalities of finite distributive lattices, Mitteilungen aus dem Mathematischen Seminar Giessen, 121 (1976), 103-124.
G. Kreweras, Les preordres totaux compatibles avec un ordre partiel. Math. Sci. Humaines No. 53 (1976), 5-30.
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LINKS
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Index entries for sequences related to posets
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MATHEMATICA
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MatrixPower[ ZetaP[ #, n + 1 ][ [ 1, Card[ # ] ] ]&@JofP[ Chain[ 2, 2, 4 ] ]
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CROSSREFS
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Cf. A000372, A056932, A006360, A006362, A056933, A056934, A056935, A056936, A056937.
Sequence in context: A112497 A122814 A112490 this_sequence A075350 A075914 A075924
Adjacent sequences: A006358 A006359 A006360 this_sequence A006362 A006363 A006364
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KEYWORD
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nonn,easy
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AUTHOR
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njas
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EXTENSIONS
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More terms from Mitch Harris (Harris.Mitchell(AT)mgh.harvard.edu), Jul 16 2000
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