%I #9 Jan 14 2016 16:35:19
%S 1,1,2,6,20,89,446,2724,19877,190403,2605863,53510680,1624371850
%N Number of unlabeled and connected graphs on n vertices which have no induced subgraph isomorphic to the 'fork' (fork = 4 vertices forming a path with a fifth vertex adjacent only to one of the non-end vertices).
%H F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version b882bc9.
%K more,nonn
%O 1,3
%A _Jim Nastos_, Jan 14 2003
%E More terms added using tinygraph by _Falk Hüffner_, Jan 12 2016