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Search: id:A125484
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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
1
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| 1, 27, 423, 5607, 85683, 1337727, 21331503, 344238579, 5599424547, 91540779903, 1501346684863, 24673460611915, 406009294231251, 6686397678162879, 110171301582051951, 1815861973753907787, 29935310771775478339
(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(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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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
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CROSSREFS
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Sequence in context: A036222 A022655 A096950 this_sequence A022751 A004326 A028166
Adjacent sequences: A125481 A125482 A125483 this_sequence A125485 A125486 A125487
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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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