A183582 - OEIS

%I #4 Mar 31 2012 12:35:52

%S 80,65277,14823037,3724940988,922710498351,229716738097391,

%T 57140106100076100,14217486118795912134

%N Half the number of nX7 0..3 arrays with each element equal to either the maximum or the minimum of its horizontal and vertical neighbors

%C Column 7 of A183584

%e Some solutions with a(1,1)<=1 for 3X7

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 05 2011