A125328 Number of base 18 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 18, 114, 582, 3466, 20938, 129642, 813586, 5161418, 33012690, 212531034, 1375465890, 8940439306, 58322410658, 381620168176, 2503490173972, 16459423126778, 108417784128158, 715300322712000, 4725856346389840

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: A192511 A324623 A244866 * A126486 A251937 A061803

Adjacent sequences: A125325 A125326 A125327 * A125329 A125330 A125331

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved