A125466 Number of base 31 circular n-digit numbers with adjacent digits differing by 8 or less.

1, 31, 455, 5503, 77399, 1110451, 16305215, 242704675, 3649992607, 55305511789, 842747008815, 12896518373649, 197988896900735, 3046905470601517, 46975007273893153, 725216490511279543, 11207606597478569967

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: A187630 A118196 A160443 * A142280 A160894 A010947

Adjacent sequences: A125463 A125464 A125465 * A125467 A125468 A125469

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved