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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A297218 Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's. 1

%I #7 Apr 19 2020 23:54:46

%S 1,4,24,207,5570,261939,20599895,3819208252,1400212345305,

%T 937962844219314,1312275096984570369,3708386833907642906568,

%U 20177474743877943669370721,220442917573207336661039688056

%N Number of n X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 neighboring 1's.

%C Diagonal of A297224.

%H R. H. Hardin, <a href="/A297218/b297218.txt">Table of n, a(n) for n = 1..23</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A297224.

%K nonn

%O 1,2

%A _R. H. Hardin_, Dec 27 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.

Last modified May 29 22:39 EDT 2023. Contains 363044 sequences. (Running on oeis4.)