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!)
A125539 Number of n X n arrays with entries in 1..8 in which adjacent entries differ by 5 or less (adjacent means in x or y directions). 0
1, 8, 2902, 52127130, 45120225704486, 1888405717902201691046, 3819825084723229625771326323002, 373453238394596300163358238712837771590526 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base+1,n,diff)=a(base,n,diff)+F(n,diff) for base>=2.diff.(n-1) and F(n,diff)= (n=2, A063496(diff+1)) (n=3, A068744(diff+1)) (n=4, A068745(diff+1)) (n=5, A068746(diff+1)) (n=6, A068747(diff+1))

LINKS

Table of n, a(n) for n=0..7.

PROG

(S/R) stvar $[N][N]:(0.. M-1) init $[][]:=0 asgn $[][]->{*} kill +[i in 0.. N-2](+[j in 0.. N-1](($[i][j]`-$[i+1][j]`>5)+($[i+1][j]`-$[i][j]`>5)+($[j][i]`-$[j][i+1]`>5)+($[j][i+1]`-$[j][i]`>5)))

CROSSREFS

Sequence in context: A185901 A078525 A280282 * A297922 A298546 A298336

Adjacent sequences:  A125536 A125537 A125538 * A125540 A125541 A125542

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2006

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 September 27 10:35 EDT 2020. Contains 337380 sequences. (Running on oeis4.)