A125461 Number of base 26 circular n-digit numbers with adjacent digits differing by 8 or less.

1, 26, 370, 4418, 60994, 859946, 12394450, 180932330, 2664959170, 39489358346, 587550685330, 8766115538074, 131030613689314, 1960994655183018, 29372400375221042, 440191998016208378, 6599400854146523778

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(8) for base>=8.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]`-$[(i+1)mod N]`>8)+($[(i+1)mod N]`-$[i]`>8))

Crossrefs

Sequence in context: A022590 A364010 A004414 * A022654 A183187 A004318

Adjacent sequences: A125458 A125459 A125460 * A125462 A125463 A125464

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved