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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A266018 Number of nXn integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself. 0
1, 7, 33, 577, 39064, 4285397, 1577145547, 1561479265416 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A266025.

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A266025.

Sequence in context: A197565 A202762 A202757 * A001795 A209897 A209814

Adjacent sequences:  A266015 A266016 A266017 * A266019 A266020 A266021

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 21 06:25 EDT 2018. Contains 316405 sequences. (Running on oeis4.)