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Number of nX6 0..1 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.
1

%I #4 Dec 28 2016 07:02:23

%S 9,263,3931,43094,421214,3755997,31821879,258976696,2046791216,

%T 15814457993,120011332264,897444910233,6629487497213,48466584078054,

%U 351182574432103,2524953934109755,18030795547257916,127983331651736137

%N Number of nX6 0..1 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 A280180.

%H R. H. Hardin, <a href="/A280178/b280178.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%Y Cf. A280180.

%K nonn

%O 1,1

%A _R. H. Hardin_, Dec 28 2016