A125450 Number of base 15 circular n-digit numbers with adjacent digits differing by 8 or less.

1, 15, 183, 2031, 24907, 309275, 3863091, 48336527, 605167019, 7578088593, 94901326543, 1188486366599, 14883984640087, 186399715293651, 2334380328957769, 29234663364972731, 366120980626529371

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: A016158 A335509 A193701 * A193709 A157689 A273654

Adjacent sequences: A125447 A125448 A125449 * A125451 A125452 A125453

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved