A233476 - OEIS

%I #4 Dec 11 2013 04:31:22

%S 8840905,1542165988,264110152411,45223720670867,7732943732414030,

%T 1322255733920272536,226068657791038230800,38651333034861710486643,

%U 6608229637236101895009182,1129810754947963897221965651

%N Number of (n+2)X(2+2) 0..3 arrays with no increasing sequence of length 3 horizontally or vertically

%C Column 2 of A233480

%H R. H. Hardin, <a href="/A233476/b233476.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=1

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 11 2013