A207209 - OEIS

%I #5 Mar 31 2012 12:37:16

%S 25,625,11047,192640,3375548,59151458,1037800112,18215805862,

%T 319825973303,5615850283553,98614829798053,1731697303682807,

%U 30409166647098498,533994742590497215,9377124049344199017

%N Number of 3Xn 0..2 arrays avoiding the pattern z-1 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

%C Row 3 of A207208

%H R. H. Hardin, <a href="/A207209/b207209.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 15 2012