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A124948 Number of base 20 circular n-digit numbers with adjacent digits differing by 2 or less. 1
1, 20, 94, 350, 1522, 6670, 29992, 136548, 628362, 2914622, 13606624, 63855108, 300982084, 1423941500, 6758032522, 32161829650, 153427657050, 733475019582, 3513035370640, 16854198764892, 80981882536292, 389635048394172 (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..21.

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: A281391 A071092 A144359 * A126407 A158446 A221704

Adjacent sequences:  A124945 A124946 A124947 * A124949 A124950 A124951

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified September 25 13:01 EDT 2020. Contains 337344 sequences. (Running on oeis4.)