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A125484
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Number of base 27 circular n-digit numbers with adjacent digits differing by 9 or less.
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0
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1, 27, 423, 5607, 85683, 1337727, 21331503, 344238579, 5599424547, 91540779903, 1501346684863, 24673460611915, 406009294231251, 6686397678162879, 110171301582051951, 1815861973753907787, 29935310771775478339
(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(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
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CROSSREFS
| Sequence in context: A022655 A155988 A096950 * A022751 A004326 A028166
Adjacent sequences: A125481 A125482 A125483 * A125485 A125486 A125487
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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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