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A245846 Number of length n 0..3 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 A245846 #6 Jul 23 2025 11:29:49
%S A245846 1,1,2,2,5,5,15,17,77,101,551,861,5433,9055,61725,107467,758905,
%T A245846 1355573,9770843,17740093,129645671,238154311,1758252307,3258924505,
%U A245846 24252921697,45276251763,339138059251,636861131319,4796151474225,9051310984485
%N A245846 Number of length n 0..3 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 A245846 Column 3 of A245851
%H A245846 R. H. Hardin, <a href="/A245846/b245846.txt">Table of n, a(n) for n = 1..117</a>
%e A245846 Some solutions for n=12
%e A245846 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
%e A245846 ..1....1....1....1....0....1....1....1....1....1....1....1....1....1....1....1
%e A245846 ..1....1....2....2....1....2....2....2....0....1....0....0....2....1....0....1
%e A245846 ..2....2....0....0....2....3....1....1....1....2....2....2....3....0....2....2
%e A245846 ..2....2....1....1....1....1....2....1....1....2....0....3....1....2....3....2
%e A245846 ..2....1....2....0....2....3....3....3....2....3....1....1....1....0....3....2
%e A245846 ..0....1....2....0....2....2....1....2....0....3....0....1....1....2....3....3
%e A245846 ..2....2....0....0....2....3....1....2....1....3....1....3....1....1....3....1
%e A245846 ..1....2....2....2....1....2....2....2....0....0....2....2....3....2....2....1
%e A245846 ..2....1....1....1....0....2....2....1....1....2....1....0....2....1....0....2
%e A245846 ..1....1....1....1....1....1....1....1....1....1....0....1....1....0....1....1
%e A245846 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
%K A245846 nonn
%O A245846 1,3
%A A245846 _R. H. Hardin_, Aug 04 2014