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Search: id:A124935
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| A124935 |
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Number of base 18 circular n-digit numbers with adjacent digits differing by 2 or less. |
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+0
1
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| 1, 18, 84, 312, 1352, 5908, 26490, 120278, 552032, 2553972, 11892734, 55672118, 261759734, 1235323302, 5848421012, 27764530552, 132124679472, 630077734772, 3010344270942, 14406602755262, 69048608938842, 331383832210022
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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[Empirical] a(base,n)=a(base-1,n)+A005191(n+1) for base>=2.int(n/2)+1
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PROGRAM
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(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))
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CROSSREFS
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Sequence in context: A039358 A043961 A067984 this_sequence A126405 A141842 A063788
Adjacent sequences: A124932 A124933 A124934 this_sequence A124936 A124937 A124938
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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