A125401 Number of base 13 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 13, 127, 1105, 10795, 107393, 1079611, 10895625, 110142955, 1114176427, 11273835207, 114087679433, 1154585364439, 11684809702241, 118255306926065, 1196798479732385, 12112170879045915, 122581006718527659

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: A201086 A139786 A016169 * A089763 A124298 A201040

Adjacent sequences: A125398 A125399 A125400 * A125402 A125403 A125404

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved