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Search: id:A125469
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| A125469 |
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Number of base 12 circular n-digit numbers with adjacent digits differing by 9 or less. |
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+0
1
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| 1, 12, 138, 1542, 17782, 205222, 2369460, 27358168, 315883982, 3647274798, 42112344498, 486239639898, 5614244249860, 64823465468332, 748467912775938, 8641997344805782, 99782658458533982, 1152115481155283262
(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: A000467 A059517 A097167 this_sequence A113366 A003379 A124206
Adjacent sequences: A125466 A125467 A125468 this_sequence A125470 A125471 A125472
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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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