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A230678 Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).

%I A230678 #7 Jun 02 2025 08:45:32
%S A230678 0,423,17271,730503,37034355,1844154933,91258562955,4522036938501,
%T A230678 224105728666527,11105653159056021,550345235166102387,
%U A230678 27272655718068842535,1351510936295338591335,66974836192708860686913
%N A230678 Number of 4Xn 0..2 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value 2-x(i,j).
%C A230678 Row 4 of A230675
%H A230678 R. H. Hardin, <a href="/A230678/b230678.txt">Table of n, a(n) for n = 1..210</a>
%H A230678 R. H. Hardin, <a href="/A230678/a230678.txt">Empirical recurrence of order 64</a>
%F A230678 Empirical recurrence of order 64 (see link above)
%e A230678 Some solutions for n=3
%e A230678 ..1..1..0....0..1..0....1..1..1....1..1..2....1..1..1....1..0..2....2..0..1
%e A230678 ..1..2..0....0..2..1....2..0..1....1..0..2....0..2..0....1..1..2....1..1..2
%e A230678 ..2..2..0....0..1..0....2..2..0....1..1..1....2..2..2....0..1..1....1..1..1
%e A230678 ..0..0..2....1..0..2....0..2..0....0..2..1....2..0..0....1..2..1....0..2..1
%K A230678 nonn
%O A230678 1,2
%A A230678 _R. H. Hardin_, Oct 27 2013