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Search: id:A125407
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| A125407 |
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Number of base 19 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 19, 205, 1867, 19609, 210299, 2304745, 25570683, 286088961, 3218305099, 36333221305, 411138068195, 4659331066705, 52854308911787, 599940896079401, 6812571733982387, 77379505012100545, 879048702969334779
(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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Adjacent sequences: A125404 A125405 A125406 this_sequence A125408 A125409 A125410
Sequence in context: A113596 A085770 A002501 this_sequence A023017 A022647 A032613
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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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