%I A002560 M3203 N1295
%S A002560 1,1,4,2,7,5,15,6,37,13,36,32,37,34,73,58,183,150,262,186,1009,420,
%T A002560 707,703,760,1180,4639
%N A002560 Number of polygonal graphs.
%D A002560 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A002560 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002560 M. A. Sainte-Lagu\"{e}, Les R\'{e}seaux (ou Graphes)}, M\'{e}morial des 
               Sciences Math\'{e}matiques, Fasc. 18, Gauthier-Villars, Paris, 1923, 
               p. 61. http://www.numdam.org/item?id=AFST_1923_3_15__27_0
%Y A002560 Sequence in context: A131914 A115302 A109857 this_sequence A124908 A143370 
               A016695
%Y A002560 Adjacent sequences: A002557 A002558 A002559 this_sequence A002561 A002562 
               A002563
%K A002560 nonn
%O A002560 4,3
%A A002560 N. J. A. Sloane (njas(AT)research.att.com).
%E A002560 Reference corrected by Georg Muntingh (georg.muntingh(AT)gmail.com), 
               Jul 07 2009