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Number of nX6 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
0

%I #3 Dec 29 2016 04:03:32

%S 30,1072,20593,320755,4245153,51995541,607401930,6826834071,

%T 74866926296,803333083744,8481136146360,88284309868714,

%U 908465381543452,9254692532815689,93470995500319234

%N Number of nX6 0..2 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

%C Column 6 of A280217.

%e Some solutions for n=3

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

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

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

%Y Cf. A280217.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 29 2016