A125437 Number of base 25 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 25, 319, 3385, 41647, 522925, 6717127, 87439069, 1149386407, 15213415573, 202370895399, 2701584846557, 36157460122255, 484806234281277, 6508805756745191, 87464954360562805, 1176115987345565255

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n

Links

Table of n, a(n) for n=0..16.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))

Crossrefs

Sequence in context: A053805 A240846 A228255 * A250318 A250559 A244446

Adjacent sequences: A125434 A125435 A125436 * A125438 A125439 A125440

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved