%I A055192
%S A055192 1,2,5,12,35,108,393,1666,8543,54190,436740,4565450,62930604,
%T A055192 1156277748,28509174012,946786816168,42448800498744,2573207315483554,
%U A055192 211180300735118954,23490473719472829824,3545759835559406756008
%N A055192 Number of bipartite graphs with n vertices, no isolated vertices and 
               a distinguished bipartite block, up to isomorphism.
%Y A055192 Equals second differences of A049312. Cf. A024206, A055609, A055082-A055084.
%Y A055192 Row sums of A056152 and also of A122083.
%Y A055192 Sequence in context: A036357 A000104 A000105 this_sequence A108555 A032203 
               A094717
%Y A055192 Adjacent sequences: A055189 A055190 A055191 this_sequence A055193 A055194 
               A055195
%K A055192 nonn
%O A055192 2,2
%A A055192 Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 18 2000