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Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only either three adjacent vertically or three adjacent horizontally.
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%I #3 Mar 31 2012 12:35:08

%S 1,1,1,1,2,3,6,9,29,71,252,692,3368,13077,79134,377418,2968590,

%T 18765157,189063004,1516592933,19680440925,204860397699,3422227126547,

%U 45691959144342,982062906171101,16911337817136038,468085274414196900

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only either three adjacent vertically or three adjacent horizontally.

%K nonn

%O 1,5

%A _R. H. Hardin_, Oct 17 2008