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A125408
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Number of base 20 circular n-digit numbers with adjacent digits differing by 6 or less.
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0
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1, 20, 218, 1994, 21078, 227450, 2509508, 28044008, 316237326, 3587876114, 40876370578, 467018577782, 5345948876388, 61273602792708, 702905295827666, 8068104827974874, 92643421204990558, 1064070251138125106
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| [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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PROG
| (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
| Sequence in context: A121204 A128823 A141790 * A140236 A004411 A140354
Adjacent sequences: A125405 A125406 A125407 * A125409 A125410 A125411
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006
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