A125368 Number of base 31 circular n-digit numbers with adjacent digits differing by 4 or less.

1, 31, 259, 1711, 13259, 104181, 838567, 6839941, 56392139, 468718939, 3921391169, 32982034061, 278635097351, 2362736395895, 20099255075641, 171451320170481, 1466033625495387, 12562096168712455, 107842286116562887

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1

Links

Table of n, a(n) for n=0..18.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))

Crossrefs

Sequence in context: A142623 A089705 A180471 * A126526 A008386 A161558

Adjacent sequences: A125365 A125366 A125367 * A125369 A125370 A125371

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved