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Search: id:A002885
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| A002885 |
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Number of cyclic Steiner triple systems of order 2n+1.
(Formerly M0032 N0393)
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+0
1
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| 1, 1, 0, 1, 0, 0, 1, 2, 0, 4, 7, 0, 12, 8, 0, 80, 84, 0, 820, 798, 0, 9508, 11616, 0, 157340, 139828, 0, 3027456, 2353310
(list; graph; listen)
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OFFSET
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0,8
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REFERENCES
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C. J. Colbourn and A. Rosa: Triple Systems, Clarendon Press (Oxford) 1999
J. Doyen, Problem 30, p. 504 of R. K. Guy et al., editors, Combinatorial Structures and Their Applications (Proceedings Calgary Conference Jun 1969}), Gordon and Breach, NY, 1970.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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Index entries for sequences related to Steiner systems
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CROSSREFS
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Sequence in context: A098123 A066659 A085623 this_sequence A011121 A117902 A021087
Adjacent sequences: A002882 A002883 A002884 this_sequence A002886 A002887 A002888
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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).
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EXTENSIONS
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More terms from Michael Steyer (m.steyer(AT)osram.de), Jan 27 2005
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