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A212945 Number of 3Xn 0..n-1 arrays with no column j greater than or equal to than column j-1 in all rows.

%I A212945 #6 Jul 22 2025 23:01:09
%S A212945 1,37,9019,6470341,10058484751,28744943858947,135992452878101359,
%T A212945 989783189762563737541,10495013926448689085587447,
%U A212945 155433527883236057504375249287,3109085470816411449764436167502547
%N A212945 Number of 3Xn 0..n-1 arrays with no column j greater than or equal to than column j-1 in all rows.
%C A212945 Row 3 of A212943
%H A212945 R. H. Hardin, <a href="/A212945/b212945.txt">Table of n, a(n) for n = 1..19</a>
%e A212945 Some solutions for n=4
%e A212945 ..2..1..2..3....2..2..0..2....1..1..2..0....1..0..3..2....1..0..0..3
%e A212945 ..0..1..2..0....2..1..1..0....2..2..1..0....2..1..2..1....0..0..1..1
%e A212945 ..0..1..0..2....1..1..2..2....3..2..2..0....1..3..2..0....1..3..1..0
%K A212945 nonn
%O A212945 1,2
%A A212945 _R. H. Hardin_ May 31 2012