A210155 - OEIS

%I #5 Mar 31 2012 12:37:32

%S 502659771,16211961522199,520586406508252346,16724671741551847807857,

%T 537278068297042230986389307,17260102700582704755575246996125,

%U 554481819709548465938736952622972588

%N 1/4 the number of (n+1)X8 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences

%C Column 7 of A210156

%H R. H. Hardin, <a href="/A210155/b210155.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 18 2012