%I #7 Mar 30 2012 16:47:28
%S 0,0,0,1,4,11,26,58,121,240,454,835
%N Number of matroids: column 4 of A034328.
%D Computed by Harald Fripertinger (fripert(AT)kfunigraz.ac.at).
%H <a href="/index/Mat#matroid">Index entries for sequences related to matroids</a>
%H H. Fripertinger, <a href="http://www.mathe2.uni-bayreuth.de/frib/codes/tables.html">Isometry Classes of Codes</a>
%Y Cf. A034327-.
%K nonn
%O 0,5
%A _N. J. A. Sloane_.