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Number of (n+1)X4 0..2 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum
1

%I #5 Mar 31 2012 12:36:02

%S 361,24993,554305,16830089,455401149,13132512119,367637937923,

%T 10506617192993,296987801260129,8464347660715807,240114023418741889,

%U 6835977634553467489,194207139150443251969,5526371145953118444347

%N Number of (n+1)X4 0..2 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum

%C Column 3 of A185614

%H R. H. Hardin, <a href="/A185612/b185612.txt">Table of n, a(n) for n = 1..61</a>

%e Some solutions for 3X4

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 31 2011