A125413 Number of base 25 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 25, 283, 2629, 28423, 313205, 3533323, 40410633, 467043615, 5439818107, 63736363043, 750192541937, 8861195897479, 104954282605873, 1245741516044273, 14810409132947099, 176301253742737935

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))

Crossrefs

Sequence in context: A061617 A078463 A231790 * A160084 A265967 A225873

Adjacent sequences: A125410 A125411 A125412 * A125414 A125415 A125416

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved