%I #7 May 09 2019 14:52:38
%S 1,1,1,3,6,18,55,230,1063,6161,41004,312782,2618995,23549346,222764216
%N Number of connected triangle-free planar graphs with n nodes.
%H F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties, version 9766535.
%K nonn,nice,hard
%O 1,4
%A _Brendan McKay_
%E a(12)-a(15) added using tinygraph by _Falk Hüffner_, May 09 2019