%I A018240
%S A018240 1,1,2,3,7,12,24,45,91,176,352,693,1387,2752
%N A018240 Rational knots with n crossings (up to mirroring).
%D A018240 E. Ernst and D. W. Sumners, "The growth of the number of prime knots", 
               Math. Proc. Cambridge Philos. Soc. vol. 102 pages 303-315.
%Y A018240 There is a conjecture that this is the same as A090596.
%Y A018240 Sequence in context: A000630 A036538 A108742 this_sequence A090596 A054272 
               A129016
%Y A018240 Adjacent sequences: A018237 A018238 A018239 this_sequence A018241 A018242 
               A018243
%K A018240 nice,nonn
%O A018240 3,3
%A A018240 Alexander Stoimenow (stoimeno(AT)math.toronto.edu)