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Search: id:A124948
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A124948 Number of base 20 circular n-digit numbers with adjacent digits differing by 2 or less. +0
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; listen)
OFFSET

0,2

COMMENT

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

PROGRAM

(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

Adjacent sequences: A124945 A124946 A124947 this_sequence A124949 A124950 A124951

Sequence in context: A006566 A027849 A071092 this_sequence A126407 A039610 A128676

KEYWORD

nonn

AUTHOR

Ron Hardin (rhh(AT)cadence.com), Dec 28 2006

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.


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