A212924 - OEIS

%I #6 Dec 18 2015 18:18:11

%S 1,15,18226,4041974015,285912852294921876,

%T 10046278068363977051128904352,

%U 252848108054080530934326716965286554552380,6218295117529777826597449794390561827118547543121719263231

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

%C Diagonal of A212930

%H R. H. Hardin, <a href="/A212924/b212924.txt">Table of n, a(n) for n = 1..13</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ May 31 2012