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A209850 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences 0

%I

%S 25,2829,1386131,3111914707,31192434742293,1413503057063618368,

%T 287490532338602681041344,263539796114390477346345246841

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

%C Diagonal of A209858

%e Some solutions for n=4

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 14 2012

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Last modified January 25 10:19 EST 2022. Contains 350565 sequences. (Running on oeis4.)