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Number of n X n binary matrices with every 1 adjacent to another 1 horizontally or vertically.
1

%I #4 Mar 31 2012 12:35:06

%S 1,10,250,22946,8222576,11168045764,57451983566596,

%T 1121231537486377866,82999668877677132763564,

%U 23304040481827726137141908956,24817820869161647380317564563160782

%N Number of n X n binary matrices with every 1 adjacent to another 1 horizontally or vertically.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 14 2008