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

 

Logo

Annual Appeal: Today, Nov 11 2014, is the 4th anniversary of the launch of the new OEIS web site. 70,000 sequences have been added in these four years, all edited by volunteers. Please make a donation (tax deductible in the US) to help keep the OEIS running.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A197402 Number of nXn 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4 0
1, 9, 60, 3305, 356211, 93153650, 77683473682, 174585377113223 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

Diagonal of A197409

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions containing all values 0 to 4 for n=4

..1..3..1..0....0..1..1..0....0..0..0..1....1..0..2..1....1..0..1..2

..0..1..1..0....0..1..4..1....2..1..1..1....3..1..1..0....1..1..4..1

..2..1..4..1....2..1..1..3....1..4..1..0....1..4..1..0....0..1..1..0

..1..0..1..2....1..0..0..1....0..1..3..1....0..1..3..1....1..3..1..0

CROSSREFS

Sequence in context: A153820 A009139 A086018 * A213133 A159037 A138589

Adjacent sequences:  A197399 A197400 A197401 * A197403 A197404 A197405

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 14 2011

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified December 21 13:45 EST 2014. Contains 252321 sequences.