%I
%S 1,1,1,1,3,8,27,89,350,1943,13578,114816,1134812,13374912,197153652,
%T 3619365346,81478825413,2227027591689,73860566227987,3001388762491543,
%U 149854380038852307,9172310473214513455,686434022927867658469
%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only either four adjacent vertically or four adjacent horizontally.
%K nonn
%O 1,5
%A _R. H. Hardin_, Oct 19 2008
