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 A125535 Number of n X n arrays with entries in 1..6 in which adjacent entries differ by 3 or less (adjacent means in x or y directions). 0
 1, 6, 694, 1842302, 106627685414, 135334709216482502, 3763490062900640355493914, 2293235289704399729849626764238522, 30618002869205254395943653838381933205254046 (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]`>3)+(\$[i+1][j]`-\$[i][j]`>3)+(\$[j][i]`-\$[j][i+1]`>3)+(\$[j][i+1]`-\$[j][i]`>3))) CROSSREFS Sequence in context: A046985 A159371 A159620 * A116298 A112637 A289366 Adjacent sequences:  A125532 A125533 A125534 * A125536 A125537 A125538 KEYWORD nonn AUTHOR R. H. Hardin, Dec 31 2006 STATUS approved

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Last modified August 8 23:02 EDT 2020. Contains 336300 sequences. (Running on oeis4.)