A180758 - OEIS

%I #3 Mar 31 2012 12:35:46

%S 0,21,67,2059,41755,986376,22238670,514990479,11843513563,

%T 273193577866,6295815062637,145178091690740,3347707869286493,

%U 77204310077778551,1780484848971706031,41062118413701907548,946988189894419322573

%N Half the number of nX9 binary arrays with each element equal to at least two neighbors

%C Column 9 of A180760

%H R. H. Hardin, <a href="/A180758/b180758.txt">Table of n, a(n) for n=1..99</a>

%K nonn

%O 1,2

%A _R. H. Hardin_ Sep 20 2010