login
Number of 7Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
1

%I #4 Jan 30 2017 10:46:51

%S 0,400,5191,117401,1770697,28237876,436154254,6282549989,91589152155,

%T 1288443030127,17891751065943,246129086382234,3333215777163938,

%U 44817385604532614,597117631739752174,7892791183495285965

%N Number of 7Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

%C Row 7 of A281802.

%H R. H. Hardin, <a href="/A281808/b281808.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

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

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

%Y Cf. A281802.

%K nonn

%O 1,2

%A _R. H. Hardin_, Jan 30 2017