%I A054951
%S A054951 1,1,4,78,4960,1041872,704369984,1579641879248,12137443766888448,
%T A054951 328148810741254606592,31830752699315833628787200
%N A054951 Number of unlabeled semi-strong digraphs on n nodes with mutually nonisomorphic 
               components.
%D A054951 V. A. Liskovets, A contribution to the enumeration of strongly connected 
               digraphs, Dokl. AN BSSR, 17 (1973), 1077-1080 (Russian), MR49#4849.
%H A054951 V. A. Liskovets, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">
               Some easily derivable sequences</a>, J. Integer Sequences, 3 (2000), 
               #00.2.2.
%Y A054951 Cf. A035512, A049387.
%Y A054951 Sequence in context: A052271 A080989 A006267 this_sequence A048957 A006425 
               A065930
%Y A054951 Adjacent sequences: A054948 A054949 A054950 this_sequence A054952 A054953 
               A054954
%K A054951 nonn,easy
%O A054951 1,3
%A A054951 N. J. A. Sloane (njas(AT)research.att.com), May 24 2000
%E A054951 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 11 2003