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1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
0

%I #6 Mar 31 2012 12:36:04

%S 8,2765,546280,139230658,32611077940,7921723799549,1897334511466261,

%T 457135757368429048,109875454057222039886,26435697398605508731039,

%U 6357732815393016703934708,1529282331683348275213637905

%N 1/8 the number of nX4 0..7 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

%C Column 4 of A185903

%e Some solutions for 3X4 with a(1,1)=0

%e ..0..4..4..3....0..0..6..6....0..4..1..0....0..0..4..5....0..0..5..4

%e ..0..0..1..3....2..0..3..3....0..4..1..0....4..0..4..5....0..6..5..4

%e ..6..6..1..1....2..2..2..3....7..7..2..2....4..0..3..3....0..6..3..3

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 06 2011