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Number of nX7 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
1

%I #4 Jan 02 2017 10:44:27

%S 36,158,7440,388686,18736311,874372050,39877186802,1785907191220,

%T 78870855453277,3444569084276494,149070940550252478,

%U 6402525766461308426,273223888032122659020,11595632519907543615784,489776602503009888381042

%N Number of nX7 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

%C Column 7 of A280398.

%H R. H. Hardin, <a href="/A280397/b280397.txt">Table of n, a(n) for n = 1..26</a>

%e Some solutions for n=3

%e ..0..0..0..0..0..0..1. .0..0..0..1..1..2..2. .0..0..0..0..0..0..0

%e ..0..2..2..0..0..1..0. .0..0..1..1..1..2..2. .1..1..1..1..1..0..0

%e ..2..2..0..0..0..0..0. .1..1..1..1..2..2..2. .2..2..1..1..0..0..0

%Y Cf. A280398.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 02 2017