A125405 Number of base 17 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 17, 179, 1613, 16671, 175997, 1895225, 20625195, 225921167, 2484099839, 27375009299, 302070295753, 3335748494373, 36852890454111, 407250892930795, 4501090733738663, 49752097424468319, 549954856054818293

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..17.

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: A246058 A121793 A042985 * A342198 A130651 A142214

Adjacent sequences: A125402 A125403 A125404 * A125406 A125407 A125408

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved