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!)
A252803 Number of (n+2)X(n+2) 0..4 arrays with every consecutive three elements in every row and column not having exactly two distinct values, and in every diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 0
61, 259, 1337, 742, 3186, 30949, 17895, 69935, 626266, 365400, 1352156, 11593615, 6769977, 24284345, 203188660 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A252811

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A152413 A029815 A142424 * A302282 A140854 A091912

Adjacent sequences:  A252800 A252801 A252802 * A252804 A252805 A252806

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 22 2014

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 9 20:55 EDT 2020. Contains 333363 sequences. (Running on oeis4.)