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A145792 Number of n X n binary arrays symmetric about main diagonal with all ones connected only either four adjacent vertically or four adjacent horizontally. 0

%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

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Last modified September 19 23:59 EDT 2019. Contains 327207 sequences. (Running on oeis4.)