A238725 - OEIS

%I #4 Mar 03 2014 16:10:05

%S 16,170,2704,24298,359456,3022230,43248968,354823094,4990305568,

%T 40601871406,565368140984,4590068472250,63524027304400,

%U 515796560253008,7110064227756832,57780149815277172,794366012177843040

%N Number of nX7 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it

%C Column 7 of A238726

%H R. H. Hardin, <a href="/A238725/b238725.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 03 2014