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A186213 Number of (n+1)X4 0..2 arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant.

%I A186213 #7 Jul 22 2025 10:19:36
%S A186213 609,18873,308593,6275745,116461359,2259545215,43035959317,
%T A186213 826432933951,15812881574729,303053537534437,5803938965263449,
%U A186213 111189559377323685,2129829613338983271,40799287763726714069,781535113579919280543
%N A186213 Number of (n+1)X4 0..2 arrays with every 2X2 subblock determinant equal to some horizontal or vertical neighbor 2X2 subblock determinant.
%C A186213 Column 3 of A186218
%H A186213 R. H. Hardin, <a href="/A186213/b186213.txt">Table of n, a(n) for n = 1..200</a>
%e A186213 Some solutions for 3X4
%e A186213 ..2..2..1..0....0..1..1..0....1..1..0..0....2..0..0..2....1..0..1..0
%e A186213 ..0..0..0..0....2..2..0..0....1..1..0..2....0..0..0..0....2..0..2..0
%e A186213 ..1..0..1..2....1..1..0..0....0..0..0..0....2..0..2..0....1..0..2..0
%K A186213 nonn
%O A186213 1,1
%A A186213 _R. H. Hardin_ Feb 15 2011