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Search: id:A124713
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| A124713 |
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Number of base 20 circular n-digit numbers with adjacent digits differing by 1 or less. |
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+0
1
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| 1, 20, 58, 134, 358, 950, 2596, 7160, 19966, 56078, 158488, 450140, 1283848, 3674600, 10549282, 30365294, 87605806, 253263470, 733498744, 2127803180, 6181574548, 17982188708, 52373316262, 152706201170, 445700295760
(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)+A002426(n+1) for base>=1.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]`-$[(i+1)mod N]`>1)+($[(i+1)mod N]`-$[i]`>1))
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CROSSREFS
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Sequence in context: A051872 A104100 A069132 this_sequence A126374 A163761 A154072
Adjacent sequences: A124710 A124711 A124712 this_sequence A124714 A124715 A124716
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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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