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 A125540 Number of n X n arrays with entries in 1..8 in which adjacent entries differ by 6 or less (adjacent means in x or y directions). 0
 1, 8, 3650, 97167566, 149893105802018, 13409953777346510733710, 69569862634707662759990393452322, 20929881875746750076174309956907291103359630 (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]`>6)+(\$[i+1][j]`-\$[i][j]`>6)+(\$[j][i]`-\$[j][i+1]`>6)+(\$[j][i+1]`-\$[j][i]`>6))) CROSSREFS Sequence in context: A318067 A295170 A087925 * A221109 A221243 A351409 Adjacent sequences:  A125537 A125538 A125539 * A125541 A125542 A125543 KEYWORD nonn AUTHOR R. H. Hardin, Dec 31 2006 STATUS approved

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Last modified May 25 14:51 EDT 2022. Contains 354071 sequences. (Running on oeis4.)