Search: id:A055545
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%I A055545
%S A055545 1,2,4,8,17,38,98,306,1724,383172
%N A055545 Number of matroids on n points.
%C A055545 This is the total number of pairwise non-isomorphic (i.e. "unlabeled") 
               matroids on n points, with no restrictions on loops, parallel elements 
               etc.
%D A055545 Oxley, J. G., Matroid Theory. Oxford, England: Oxford University Press, 
               1993.
%H A055545 Gordon Royle and Dillon Mayhew, <a href="http://people.csse.uwa.edu.au/
               gordon/matroid-integer-sequences.html">9-element matroids</a>
%H A055545 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Matroid.html">Link to a section of The World of Mathematics.</a>
%H A055545 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               GraphVertex.html">Link to a section of The World of Mathematics.</
               a>
%H A055545 <a href="Sindx_Mat.html#matroid">Index entries for sequences related 
               to matroids</a>
%Y A055545 Cf. A002773.
%Y A055545 Sequence in context: A118928 A049312 A132043 this_sequence A036375 A036376 
               A000598
%Y A055545 Adjacent sequences: A055542 A055543 A055544 this_sequence A055546 A055547 
               A055548
%K A055545 nonn,nice
%O A055545 0,2
%A A055545 Eric Weisstein (eric(AT)weisstein.com)
%E A055545 a(9) from Gordon Royle, Dec 23 2006

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