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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
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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;
refs;
listen;
history;
text;
internal format)
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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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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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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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STATUS
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approved
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