A199040 - OEIS

%I #4 Mar 31 2012 12:36:35

%S 3,877,59384,35902575,7354780137

%N Number of nX7 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to one or two horizontal or vertical neighbors

%C Column 7 of A199041

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Nov 02 2011