A205461 - OEIS

%I #5 Mar 31 2012 12:37:06

%S 17920,597288,22414008,843904488,31625643196,1185601231024,

%T 44457471151176,1666962268642872,62503467236310480,

%U 2343599232293623768,87874636404562102448,3294903243596850745368,123544317033939549370912

%N Number of (n+1)X4 0..3 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor

%C Column 3 of A205466

%H R. H. Hardin, <a href="/A205461/b205461.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 27 2012