A162064 - OEIS

A162064

Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 9 ones in any row or column

%I #4 Dec 18 2015 18:17:22

%S 2,6,18,100,794,11268,264083,11030649,813916625,107746920222,

%T 24945674297719,9651792274718292

%N Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 9 ones in any row or column

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009