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A280906 Number of 5Xn 0..2 arrays with no element equal to more than one 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 0,1464,610448,75809243,7083739466,574982226478,42393379206019,

%T 2942502897692141,195365303234441770,12545498025247203218,

%U 784842927161230385854,48079317345677228680390,2894948350054066836940824

%N Number of 5Xn 0..2 arrays with no element equal to more than one 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 A280902.

%H R. H. Hardin, <a href="/A280906/b280906.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=2

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

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

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

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

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

%Y Cf. A280902.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 10 2017

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Last modified June 28 17:31 EDT 2022. Contains 354907 sequences. (Running on oeis4.)