

A125537


Number of n X n arrays with entries in 1..7 in which adjacent entries differ by 4 or less (adjacent means in x or y directions).


0



1, 7, 1527, 11721313, 3050388738539, 27037458180935427547, 8157016618633297682357104957, 83768469285967811192253950787571671419, 29282610870399702055320868574328652947738735891523
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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.(n1) 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.. M1) init $[][]:=0 asgn $[][]>{*} kill +[i in 0.. N2](+[j in 0.. N1](($[i][j]`$[i+1][j]`>4)+($[i+1][j]`$[i][j]`>4)+($[j][i]`$[j][i+1]`>4)+($[j][i+1]`$[j][i]`>4)))


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



