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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A208346 Number of n X n 0..3 arrays with new values 0..3 introduced in row major order and no element equal to any knight-move neighbor (colorings ignoring permutations of colors) 0
1, 15, 1095, 230387, 191586797, 647640659639 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208353

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

..0..1..1..0....0..0..1..0....0..0..1..0....0..1..1..1....0..0..0..0

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

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

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

CROSSREFS

Sequence in context: A203409 A207980 A131313 * A236329 A129764 A027552

Adjacent sequences:  A208343 A208344 A208345 * A208347 A208348 A208349

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

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 December 1 22:24 EST 2020. Contains 338858 sequences. (Running on oeis4.)