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Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all but the outermost 4 rows or columns zero
1

%I #5 Dec 18 2015 18:17:21

%S 9471845,370995866,12256154479,374124492162,10495488465847,

%T 271028317656933,6466996667053452,143211168475701734,

%U 2956378703615485863,57132980396982387053,1037683143643901254026,17777210671425885378565

%N Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and all but the outermost 4 rows or columns zero

%H R. H. Hardin, <a href="/A162030/b162030.txt">Table of n, a(n) for n=8..23</a>

%K nonn

%O 8,1

%A _R. H. Hardin_ Jun 25 2009