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!)
A233260 Number of 5Xn 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
236, 32896, 10620928, 3439984640, 1159192379392, 393427728465920, 134179300927602688, 45829217084770353152, 15662712220567239393280, 5353914504847465071509504, 1830206096861520940880625664 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A233256

LINKS

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

FORMULA

Empirical: a(n) = 512*a(n-1) -65536*a(n-2) +2490368*a(n-3) +17825792*a(n-4) -2818572288*a(n-5) +51539607552*a(n-6) -274877906944*a(n-7) for n>11

EXAMPLE

Some solutions for n=2

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

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

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

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

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

CROSSREFS

Sequence in context: A220760 A218179 A005391 * A218520 A233243 A233200

Adjacent sequences:  A233257 A233258 A233259 * A233261 A233262 A233263

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 August 4 16:10 EDT 2021. Contains 346447 sequences. (Running on oeis4.)