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Search: id:A125401
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| A125401 |
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Number of base 13 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 13, 127, 1105, 10795, 107393, 1079611, 10895625, 110142955, 1114176427, 11273835207, 114087679433, 1154585364439, 11684809702241, 118255306926065, 1196798479732385, 12112170879045915, 122581006718527659
(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)+F(6) for base>=6.int(n/2)+1, and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
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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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
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CROSSREFS
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Sequence in context: A142673 A139786 A016169 this_sequence A089763 A124298 A076457
Adjacent sequences: A125398 A125399 A125400 this_sequence A125402 A125403 A125404
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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