%I #5 Mar 31 2012 12:36:58

%S 1,50,2706,84346,2507842,83049596,2828543595,95696351404,

%T 3237561922069,109915983761733,3737520454582311,127129254610881462,

%U 4325197729686697158,147185372366419480113,5009327110121467821581,170498121168210026695996

%N Number of nX4 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

%C Column 4 of A203846

%H R. H. Hardin, <a href="/A203842/b203842.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..0..2..3..3....2..2..0..0....2..2..3..3....3..3..3..1....1..1..0..0

%e ..3..3..3..3....2..2..0..0....2..0..3..3....3..0..3..3....1..1..3..3

%e ..3..2..0..3....0..3..3..1....2..2..0..1....3..0..0..3....0..3..3..3

%e ..3..3..3..3....0..3..3..1....2..2..1..1....3..3..3..3....0..3..3..1

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 06 2012