%I #5 Mar 31 2012 12:37:23
%S 187,700075,2646531062,10084768380770,38410047476679936,
%T 146298576850884166522,557229580446475130201608,
%U 2122405243795588131572978866,8083928267793741312454314127058
%N Number of 6Xn 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors
%C Row 6 of A208408
%H R. H. Hardin, <a href="/A208413/b208413.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..0..1..0..0....0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..0
%e ..1..0..1..0....0..1..0..1....1..1..2..1....1..2..2..0....1..1..2..0
%e ..2..3..1..3....2..1..3..2....1..2..1..3....1..3..1..3....2..2..1..0
%e ..2..2..1..1....1..3..0..3....2..3..1..0....1..0..3..3....3..2..2..0
%e ..3..2..0..1....1..0..2..1....0..1..1..1....3..2..1..3....2..3..3..0
%e ..0..3..3..1....0..3..3..3....1..2..2..3....2..2..2..2....1..2..3..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 26 2012
|