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A125331 Number of base 21 circular n-digit numbers with adjacent digits differing by 3 or less. 0
1, 21, 135, 693, 4159, 25291, 157635, 995659, 6357119, 40921479, 265145505, 1727138841, 11300204035, 74208972755, 488874737353, 3229363648333, 21382430152111, 141869013922279, 942972599847861, 6277675948529895 (list; graph; refs; listen; history; text; internal format)
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: A328861 A243201 A264554 * A126489 A033595 A220388

Adjacent sequences: A125328 A125329 A125330 * A125332 A125333 A125334

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified April 1 16:47 EDT 2023. Contains 361695 sequences. (Running on oeis4.)