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A280484 Number of 5Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 1

%I

%S 0,846,17406,214635,2272190,22475478,208736159,1872290290,16303280577,

%T 138811090897,1160103714772,9546680180339,77537445203196,

%U 622719069148966,4952853901078386,39060613089881366,305763598880219395

%N Number of 5Xn 0..2 arrays with no element unequal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

%C Row 5 of A280480.

%H R. H. Hardin, <a href="/A280484/b280484.txt">Table of n, a(n) for n = 1..32</a>

%e Some solutions for n=3

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

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

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

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

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

%Y Cf. A280480.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 04 2017

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Last modified January 17 05:13 EST 2022. Contains 350378 sequences. (Running on oeis4.)