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A245847 Number of length n 0..4 arrays with new values introduced in order from both ends, and least squares fitting to a straight line with slope zero, with a single point taken as having zero slope.

%I A245847 #6 Jul 23 2025 11:29:56
%S A245847 1,1,2,2,5,5,15,17,78,102,568,918,6115,11063,84095,167139,1377562,
%T A245847 2919818,25322454,55877190,500009859,1130615111,10314022021,
%U A245847 23685168139,218801537756,507728746032,4731965243042,11064419359152,103808357373783
%N A245847 Number of length n 0..4 arrays with new values introduced in order from both ends, and least squares fitting to a straight line with slope zero, with a single point taken as having zero slope.
%C A245847 Column 4 of A245851
%H A245847 R. H. Hardin, <a href="/A245847/b245847.txt">Table of n, a(n) for n = 1..123</a>
%e A245847 Some solutions for n=12
%e A245847 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
%e A245847 ..0....0....1....1....1....0....1....1....1....1....1....1....0....1....1....1
%e A245847 ..1....0....0....1....2....1....2....0....0....0....0....2....0....1....2....2
%e A245847 ..1....1....2....2....2....1....1....2....0....2....0....3....1....0....0....3
%e A245847 ..2....0....0....1....3....0....3....2....1....1....1....3....2....2....1....2
%e A245847 ..1....2....2....1....0....0....1....3....1....0....1....1....2....1....2....0
%e A245847 ..0....2....1....2....0....0....2....0....2....0....1....4....2....3....3....2
%e A245847 ..1....0....1....3....3....0....1....3....2....2....1....2....2....1....2....3
%e A245847 ..0....1....2....2....2....1....2....2....1....0....0....3....1....2....2....2
%e A245847 ..1....0....1....0....2....1....2....0....0....1....0....2....0....1....0....2
%e A245847 ..1....0....0....1....1....0....1....1....0....1....1....1....0....0....1....1
%e A245847 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
%K A245847 nonn
%O A245847 1,3
%A A245847 _R. H. Hardin_, Aug 04 2014