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 A284081 Number of 7Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. 1

%I #4 Mar 19 2017 20:18:42

%S 0,0,353608,48994058,6011835223,700044712076,74965549398304,

%T 7663959789277668,759541318384819140,73293744586522740828,

%U 6926137628336309991716,643615455040297408956707

%N Number of 7Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.

%C Row 7 of A284075.

%H R. H. Hardin, <a href="/A284081/b284081.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

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

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

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

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

%Y Cf. A284075.

%K nonn

%O 1,3

%A _R. H. Hardin_, Mar 19 2017

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Last modified May 22 17:00 EDT 2024. Contains 372758 sequences. (Running on oeis4.)