A125454 Number of base 19 circular n-digit numbers with adjacent digits differing by 8 or less.

1, 19, 251, 2899, 38027, 509239, 6922823, 94744711, 1301066891, 17895943729, 246351600811, 3392528778229, 46727519959343, 643666830505159, 8866832290305149, 122147626590349999, 1682697341501872923

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: A017998 A018912 A021202 * A293917 A009762 A017952

Adjacent sequences: A125451 A125452 A125453 * A125455 A125456 A125457

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved