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!)
A233171 Number of nX5 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally, diagonally 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
36, 8576, 2469888, 736362496, 221463445504, 66799223701504, 20170789919653888, 6093499625887498240, 1841146791439003287552, 556341623248212690206720, 168115390615337809829953536, 50801739257391729644354404352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A233174

LINKS

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

FORMULA

Empirical: a(n) = 480*a(n-1) -60416*a(n-2) +1966080*a(n-3) +22020096*a(n-4) -1845493760*a(n-5) +22548578304*a(n-6) -68719476736*a(n-7)

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Sequence in context: A203052 A054407 A268553 * A058466 A277603 A141475

Adjacent sequences:  A233168 A233169 A233170 * A233172 A233173 A233174

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 05 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 January 25 15:08 EST 2021. Contains 340416 sequences. (Running on oeis4.)