A265212 - OEIS

A265212

Number of nX1 0..n-1 arrays with upper left zero and lower right n-1 and each element differing from its horizontal and vertical neighbors by a power of three.

%I #5 Dec 05 2015 08:37:05

%S 1,1,1,4,12,32,109,366,1189,9855,58994,296022,1959725,11368311,

%T 60437981,345527448,1904249259,10390269667,64901329419,387065403450,

%U 2241102587830,13656975359566,81191938320012,473207108106993,2804086644305202

%N Number of nX1 0..n-1 arrays with upper left zero and lower right n-1 and each element differing from its horizontal and vertical neighbors by a power of three.

%C Column 1 of A265218.

%H R. H. Hardin, <a href="/A265212/b265212.txt">Table of n, a(n) for n = 1..210</a>

%e All solutions for n=4

%e ..0....0....0....0

%e ..3....1....1....3

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

%e ..3....3....3....3

%Y Cf. A265218.

%K nonn

%O 1,4

%A _R. H. Hardin_, Dec 05 2015