login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A197228 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4 0

%I

%S 1,7,55,2117,249929,98514881,126615582841,511052139999591

%N Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4

%C Every 0 is next to 0 4's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 2's

%C Diagonal of A197235

%e Some solutions for n=4

%e ..0..0..0..0....2..0..0..2....2..0..1..0....0..1..2..0....0..0..0..1

%e ..2..0..0..1....0..0..1..0....0..0..3..1....1..3..0..0....0..0..1..3

%e ..2..0..1..3....2..1..3..1....0..0..1..0....0..1..0..0....0..0..2..1

%e ..0..0..0..1....0..0..0..0....2..0..0..0....2..0..0..0....0..0..0..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 12 2011

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 21 20:25 EDT 2019. Contains 321382 sequences. (Running on oeis4.)