A125448 Number of base 13 circular n-digit numbers with adjacent digits differing by 8 or less.

1, 13, 149, 1597, 18421, 213703, 2485463, 28921087, 336574029, 3917060635, 45587258159, 530551444117, 6174641413639, 71861459611123, 836335130323205, 9733401730942177, 113278883062209261, 1318357724085097789

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..17.

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: A130611 A127747 A090667 * A163148 A355414 A345217

Adjacent sequences: A125445 A125446 A125447 * A125449 A125450 A125451

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved