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A125538

Number of n X n arrays with entries in 1..7 in which adjacent entries differ by 5 or less (adjacent means in x or y directions).

1, 7, 2067, 26587217, 14749946711237, 353372896021348132827, 365544303118982657966348922687, 16327402400665015344535793527620336180117

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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: A056235 A139299 A004818 * A373035 A129732 A186164

Adjacent sequences: A125535 A125536 A125537 * A125539 A125540 A125541

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 31 2006

STATUS

approved

URL: https://oeis.org/A125538

⇱ A125538 - OEIS