A210154 - OEIS

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

%S 34976109,311831135649,2769555432882273,24608360596681275093,

%T 218642562001425020608504,1942625963195375544523109688,

%U 17260102700582704755575246996125,153354879298497422249886218777326738

%N 1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences

%C Column 6 of A210156

%H R. H. Hardin, <a href="/A210154/b210154.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 18 2012