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Search: id:A125470
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| A125470 |
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Number of base 13 circular n-digit numbers with adjacent digits differing by 9 or less. |
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+0
1
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| 1, 13, 157, 1813, 21997, 267483, 3255907, 39636855, 482546341, 5874634345, 71519267407, 870693584543, 10600043444419, 129047604857977, 1571058121063511, 19126458200814873, 232850330879455797
(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: A164623 A072841 A159499 this_sequence A165151 A016125 A015470
Adjacent sequences: A125467 A125468 A125469 this_sequence A125471 A125472 A125473
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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