login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A222880 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order 1
5, 131, 6282, 409775, 19707855, 1340197778, 66248732403, 4552388850792, 228017377191609, 15767959380970741, 797585318305106129, 55339415802965980962, 2819443488435447752525, 196019624814751455019691 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A222878

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..22

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A142892 A229879 A145611 * A070247 A171375 A191409

Adjacent sequences:  A222877 A222878 A222879 * A222881 A222882 A222883

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 08 2013

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 22 09:50 EDT 2022. Contains 353949 sequences. (Running on oeis4.)