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A218998 Unmatched value maps: number of nX4 binary arrays indicating the locations of corresponding elements not equal to any horizontal, diagonal or antidiagonal neighbor in a random 0..2 nX4 array.

%I A218998 #6 Jul 23 2025 00:09:32
%S A218998 7,163,2265,31857,461681,6639893,95431043,1372612359,19740345667,
%T A218998 283887907827,4082690596769,58714522782689,844392025770105,
%U A218998 12143471562419701,174639147022394875,2511541333793121239
%N A218998 Unmatched value maps: number of nX4 binary arrays indicating the locations of corresponding elements not equal to any horizontal, diagonal or antidiagonal neighbor in a random 0..2 nX4 array.
%C A218998 Column 4 of A219002
%H A218998 R. H. Hardin, <a href="/A218998/b218998.txt">Table of n, a(n) for n = 1..108</a>
%F A218998 Empirical: a(n) = 10*a(n-1) +42*a(n-2) +282*a(n-3) +281*a(n-4) +148*a(n-5) -320*a(n-6) -320*a(n-7) -256*a(n-8)
%e A218998 Some solutions for n=3
%e A218998 ..0..0..0..1....0..1..1..0....0..1..1..1....1..0..1..0....0..1..0..0
%e A218998 ..0..0..1..1....0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..0
%e A218998 ..0..0..1..1....0..1..1..1....1..0..0..0....1..1..1..0....1..0..1..0
%K A218998 nonn
%O A218998 1,1
%A A218998 _R. H. Hardin_ Nov 09 2012