A125542 Number of n X n arrays with entries in 1..9 in which adjacent entries differ by 7 or less (adjacent means in x or y directions).

1, 9, 5987, 299369303, 1119629504911493, 313365607149624564094821, 6563186624029432821357130152132207, 10286477666057808275996577778629802367615683611

Offset: 0

Author

R. H. Hardin, Dec 31 2006

Keywords

• nonn

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))