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%I #7 Mar 17 2015 15:53:36
%S 1,3,14,115,2040,109707,39445994,1560089623047
%N Number of 2-polymatroids on n labeled points.
%H Thomas J. Savitsky, <a href="http://epubs.siam.org/doi/abs/10.1137/140955094">Enumeration of 2-polymatroids on up to seven elements</a>. SIAM J. Discrete Math., 28(4):1641-1650, 2014. <a href="http://arxiv.org/abs/1401.8006">arXiv:1401.8006</a>
%Y Row sums of A256158.
%Y Cf. A256156, A256157, A058673.
%K nonn,more
%O 0,2
%A _Max Alekseyev_, Mar 16 2015
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