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A223820 Number of nX3 0..3 arrays with every row and column least squares fitting to a zero slope straight line, with a single point array taken as having zero slope.

%I A223820 #6 Jul 23 2025 04:34:02
%S A223820 16,16,256,484,12544,29584,1132096,3034564,136048896,399040576,
%T A223820 19221049600,59439415204,3000766281984,9636752993344,502638822873664,
%U A223820 1660231626483600,88755496992657664,299596751622662400
%N A223820 Number of nX3 0..3 arrays with every row and column least squares fitting to a zero slope straight line, with a single point array taken as having zero slope.
%C A223820 Column 3 of A223824
%H A223820 R. H. Hardin, <a href="/A223820/b223820.txt">Table of n, a(n) for n = 1..43</a>
%e A223820 Some solutions for n=4
%e A223820 ..1..0..1....2..1..2....0..2..0....1..0..1....3..1..3....3..2..3....0..3..0
%e A223820 ..1..0..1....3..3..3....2..2..2....2..0..2....1..3..1....1..0..1....2..0..2
%e A223820 ..1..0..1....3..0..3....2..2..2....2..0..2....1..0..1....1..3..1....2..0..2
%e A223820 ..1..0..1....2..2..2....0..2..0....1..0..1....3..2..3....3..1..3....0..3..0
%K A223820 nonn
%O A223820 1,1
%A A223820 _R. H. Hardin_ Mar 27 2013