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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A233259 Number of 4Xn 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs) 1
48, 2080, 221696, 23896064, 2647261184, 294517735424, 32835998056448, 3662495243829248, 408547159030366208, 45573786789742641152, 5083813692357704941568, 567106285442412421578752 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A233256

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 160*a(n-1) -6144*a(n-2) +86016*a(n-3) -393216*a(n-4) for n>8

EXAMPLE

Some solutions for n=3

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

..2..1..0....0..4..3....0..4..0....0..2..4....2..4..3....2..1..3....5..2..1

..5..2..5....0..1..0....0..1..5....4..3..1....2..0..4....2..5..3....4..3..1

..0..2..1....2..1..5....0..3..1....4..5..4....3..0..4....2..1..5....4..2..5

CROSSREFS

Sequence in context: A274958 A165043 A301859 * A049678 A162913 A156093

Adjacent sequences:  A233256 A233257 A233258 * A233260 A233261 A233262

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 06 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 12:36 EDT 2019. Contains 322456 sequences. (Running on oeis4.)