The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A197496 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,1,1,0 for x=0,1,2,3,4 0

%I

%S 1,1,22,181,7845,755338,182232300,122868970059,214646199763320

%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 2,3,1,1,0 for x=0,1,2,3,4

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

%C Diagonal of A197503

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Oct 15 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.

Last modified December 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)