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A212931 Number of 2Xn 0..n-1 arrays with no column j greater than column j-1 in all rows 1

%I #4 May 31 2012 11:59:27

%S 1,15,568,39695,4431876,724082352,163050236504,48442719007503,

%T 18368207542264060,8659014569831436140,4968837728849467193040,

%U 3410836618457710864892912,2760233360074280192888992948

%N Number of 2Xn 0..n-1 arrays with no column j greater than column j-1 in all rows

%C Row 2 of A212930

%H R. H. Hardin, <a href="/A212931/b212931.txt">Table of n, a(n) for n = 1..17</a>

%e Some solutions for n=3

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ May 31 2012

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Last modified December 7 14:54 EST 2023. Contains 367657 sequences. (Running on oeis4.)