A162109 - OEIS

A162109

Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order

%I #4 Dec 18 2015 18:17:23

%S 2,4,9,56,499,8000,207554,9382078,732814910,101599273769,

%T 25151730678684,11252735518379960,9169484084583765409,

%U 13716523699765295956974,37907229783585348802398136,194640906178869631364050052914

%N Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009