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A125547 Number of n X n arrays with entries in 1..12 in which adjacent entries differ by 9 or less (adjacent means in x or y directions). 0
1, 12, 17782, 3359860178, 80173083905265254, 241867388512389264991124102, 92239510661284205765199147022065188442, 4446848187806762069273466271591426934850445380022534 (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
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]`-$[i+1][j]`>9)+($[i+1][j]`-$[i][j]`>9)+($[j][i]`-$[j][i+1]`>9)+($[j][i+1]`-$[j][i]`>9)))
CROSSREFS
Sequence in context: A301533 A013514 A340166 * A159421 A159369 A175882
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 31 2006
STATUS
approved

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Last modified July 16 12:01 EDT 2024. Contains 374348 sequences. (Running on oeis4.)