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%I #12 Oct 09 2019 02:51:25
%S 1,2,7,49,733,29760,9000402
%N Number of simple matroids on n labeled points.
%H W. M. B. Dukes, <a href="http://www.stp.dias.ie/~dukes/matroid.html">Tables of matroids</a>.
%H W. M. B. Dukes, <a href="https://web.archive.org/web/20030208144026/http://www.stp.dias.ie/~dukes/phd.html">Counting and Probability in Matroid Theory</a>, Ph.D. Thesis, Trinity College, Dublin, 2000.
%H W. M. B. Dukes, <a href="https://arxiv.org/abs/math/0411557">The number of matroids on a finite set</a>, arXiv:math/0411557 [math.CO], 2004.
%H W. M. B. Dukes, <a href="http://emis.impa.br/EMIS/journals/SLC/wpapers/s51dukes.html">On the number of matroids on a finite set</a>, Séminaire Lotharingien de Combinatoire 51 (2004), Article B51g.
%H <a href="/index/Mat#matroid">Index entries for sequences related to matroids</a>
%Y Row sums of A058720.
%K nonn,nice,more
%O 2,2
%A _N. J. A. Sloane_, Dec 31 2000