%I A056988
%S A056988 0,1,8,116,4316,483835,175048780,212125583518,887136857205696,
%T A056988 13086449050056880074,691487226135525983266460
%N A056988 Number of weakly connected digraphs on n nodes that are not strongly 
               connected.
%H A056988 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               ConnectedDigraph.html">Link to a section of The World of Mathematics.</
               a>
%F A056988 A003085(n)-A035512(n)
%Y A056988 Cf. A003085, A035512.
%Y A056988 Sequence in context: A062126 A113670 A156468 this_sequence A085699 A046914 
               A116008
%Y A056988 Adjacent sequences: A056985 A056986 A056987 this_sequence A056989 A056990 
               A056991
%K A056988 nonn,more
%O A056988 1,3
%A A056988 Eric Weisstein (eric(AT)weisstein.com)