A125336 Number of base 26 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 26, 170, 878, 5314, 32546, 204290, 1299114, 8349954, 54102794, 352836290, 2313260426, 15233145250, 100686576250, 667632373298, 4439154062018, 29587484525314, 197622056861834, 1322444776094468, 8864330906128944

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

Links

Table of n, a(n) for n=0..19.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))

Crossrefs

Sequence in context: A037052 A156339 A268331 * A321113 A126494 A374489

Adjacent sequences: A125333 A125334 A125335 * A125337 A125338 A125339

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved