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Search: id:A007454
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| A007454 |
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Number of disconnected N-free posets with n nodes.
(Formerly M1630)
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+0
1
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| 1, 1, 2, 6, 18, 64, 227, 856, 3280, 12885, 51342, 207544, 847886, 3497384, 14541132, 60884173, 256480895, 1086310549, 4623128656, 19759964149, 84784735379, 365066645854, 1576927900803, 6831518134251, 29674505668536
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
P. J. Cameron, Some sequences of integers, Discrete Math., 75 (1989), 89-102; also in "Graph Theory and Combinatorics 1988", ed. B. Bollobas, Annals of Discrete Math., 43 (1989), 89-102.
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LINKS
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Index entries for sequences related to posets
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CROSSREFS
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Sequence in context: A150069 A150070 A150071 this_sequence A150072 A150073 A150074
Adjacent sequences: A007451 A007452 A007453 this_sequence A007455 A007456 A007457
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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