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 A283956 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 one element. 1

%I #4 Mar 18 2017 12:30:12

%S 0,0,597042,68693470,6816984648,669777003928,62944601744067,

%T 5709831013093658,508781396370757815,44682472147852468812,

%U 3874470768927233440485,332663634061493461202020

%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 one element.

%C Row 7 of A283950.

%H R. H. Hardin, <a href="/A283956/b283956.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

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

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

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

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

%Y Cf. A283950.

%K nonn

%O 1,3

%A _R. H. Hardin_, Mar 18 2017

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Last modified July 17 18:09 EDT 2024. Contains 374377 sequences. (Running on oeis4.)