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Search: id:A125404
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| A125404 |
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Number of base 16 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 16, 166, 1486, 15202, 158846, 1690522, 18157862, 196069282, 2123310106, 23030866946, 250026499442, 2715618543442, 29502879144794, 320569057857074, 3483472289498786, 37854839472704386, 411377395552788114
(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: A138407 A094857 A025930 this_sequence A021744 A025445 A022740
Adjacent sequences: A125401 A125402 A125403 this_sequence A125405 A125406 A125407
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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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