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Search: id:A125370
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| A125370 |
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Number of base 7 circular n-digit numbers with adjacent digits differing by 5 or less. |
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+0
1
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| 1, 7, 47, 307, 2067, 13927, 93887, 632947, 4267107, 28767367, 193939727, 1307475187, 8814549747, 59424674407, 400620795167, 2700848143027, 18208192833987, 122753397719047, 827561350484207, 5579135091500467
(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(5) for base>=5.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]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))
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CROSSREFS
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Sequence in context: A009260 A126635 A085352 this_sequence A163346 A126528 A098405
Adjacent sequences: A125367 A125368 A125369 this_sequence A125371 A125372 A125373
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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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