A125439 Number of base 27 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 27, 349, 3723, 46157, 583687, 7554133, 99104599, 1313531925, 17539619163, 235514695099, 3175602492309, 42952775347889, 582333628754047, 7908808568321989, 107551307959489303, 1463999937423331797

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))

Crossrefs

Sequence in context: A018797 A239220 A133050 * A339250 A202289 A010943

Adjacent sequences: A125436 A125437 A125438 * A125440 A125441 A125442

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved