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Number of 7Xn 0..n-1 arrays with no column j greater than column j-1 in all rows
1

%I #4 May 31 2012 12:03:16

%S 1,16383,10450787266,71832238695530495,2891333179750701904296876,

%T 475997448692406224810330915906802,

%U 252848108054080530934326716965286554552380

%N Number of 7Xn 0..n-1 arrays with no column j greater than column j-1 in all rows

%C Row 7 of A212930

%H R. H. Hardin, <a href="/A212936/b212936.txt">Table of n, a(n) for n = 1..15</a>

%e Some solutions for n=3

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

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ May 31 2012