A162113 - OEIS

A162113

Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 5 ones in any row or column.

%I #8 Oct 02 2025 23:20:01

%S 2,4,9,56,499,7547,153908,4044965,130514696,5066256614,230102555991,

%T 12148280002838,731530791483164

%N Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 5 ones in any row or column.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jun 25 2009