Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I M0032 N0393 #22 Jul 31 2024 09:49:41
%S 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,
%T 139828,0,3027456,2353310
%N Number of cyclic Steiner triple systems of order 2n+1.
%D C. J. Colbourn and A. Rosa: Triple Systems, Clarendon Press (Oxford) 1999
%D 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.
%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H <a href="/index/St#Steiner">Index entries for sequences related to Steiner systems</a>
%K nonn,more
%O 0,8
%A _N. J. A. Sloane_
%E More terms from Michael Steyer (m.steyer(AT)osram.de), Jan 27 2005