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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A196131 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4 0
1, 4, 4, 31, 326, 3716, 75720, 2040678, 86632050, 5257705657 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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

Diagonal of A196138

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A111723 A337447 A239601 * A256691 A120030 A138504

Adjacent sequences:  A196128 A196129 A196130 * A196132 A196133 A196134

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 28 2011

STATUS

approved

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 April 19 07:36 EDT 2021. Contains 343109 sequences. (Running on oeis4.)