login
Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.
1

%I #6 Aug 12 2016 06:53:59

%S 6,101,2520,77830,2643025,96489721,3689693411,146213224799,

%T 5947278854261,246989317561499,10427536481704470,446242967428521164,

%U 19312763398154267341,843835503392824253913,37171868113841641865335

%N Number of 4Xn arrays containing n copies of 0..4-1 with no element 1 greater than its northwest or northeast neighbor modulo 4 and the upper left element equal to 0.

%C Row 4 of A266681.

%H R. H. Hardin, <a href="/A266683/b266683.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A266681.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 02 2016