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Number of n X n 0..2 arrays with new values introduced in each row and column in sequential order starting with zero.
1

%I #8 Apr 14 2020 21:35:22

%S 1,2,18,1082,560778,2666449962,116124404018058,45944873892068760842,

%T 164311405786753523443114218,5298327789094557001583255058644522,

%U 1538780360110790603716817054271433490324298

%N Number of n X n 0..2 arrays with new values introduced in each row and column in sequential order starting with zero.

%C Diagonal of A268056.

%H R. H. Hardin, <a href="/A268051/b268051.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=4

%e ..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..0

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

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

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

%Y Cf. A268056.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 25 2016