login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A283640 Number of 7Xn 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. 1

%I #4 Mar 12 2017 14:41:00

%S 0,2458,203025,8209582,317384829,11651389723,392539665568,

%T 12499158065289,391064828730137,11763799548894544,348148848497732064,

%U 10109926834771861782,289155453391286387579,8172119594621868557289

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

%C Row 7 of A283634.

%H R. H. Hardin, <a href="/A283640/b283640.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

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

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

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

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

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

%Y Cf. A283634.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 12 2017

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)