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A124994 Number of base 31 circular n-digit numbers with adjacent digits differing by 2 or less. 1
1, 31, 149, 559, 2457, 10861, 49253, 226033, 1048177, 4898197, 23033019, 108861553, 516705009, 2461341589, 11760895827, 56346974689, 270594033729, 1302160086037, 6277836418979, 30315976817857, 146614887333487 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1

LINKS

Table of n, a(n) for n=0..20.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>2)+($[(i+1)mod N]`-$[i]`>2))

CROSSREFS

Sequence in context: A185513 A234122 A142758 * A126418 A347109 A142792

Adjacent sequences:  A124991 A124992 A124993 * A124995 A124996 A124997

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified May 28 22:08 EDT 2022. Contains 354122 sequences. (Running on oeis4.)