A145760 - OEIS

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A145760

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

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,3,8,27,96,569,4093,37611,421080,6366190,123605120,3088656877,

%T 98116765714,4039581343182,214357411746908,14651947137883915,

%U 1285925403332066988,145385760960996273023,21168918836708595100735

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

%K nonn

%O 1,4

%A _R. H. Hardin_, Oct 17 2008