A141049 - OEIS

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A141049

Number of n X n binary matrices, symmetric under 180 degree rotation, with rows, considered as binary numbers, in strictly increasing order.

%I #3 Mar 31 2012 12:35:07

%S 1,2,3,32,138,4080,59524,4687776,225124336,51271450616,8343603385400,

%T 5906858359525200,3340333500963917624,7785349019265044794432

%N Number of n X n binary matrices, symmetric under 180 degree rotation, with rows, considered as binary numbers, in strictly increasing order.

%K nonn

%O 2,2

%A _R. H. Hardin_, Jul 31 2008