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Search: id:A125397
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| A125397 |
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Number of base 9 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 9, 75, 597, 4999, 41959, 352605, 2963557, 24908879, 209361909, 1759712475, 14790602187, 124316856469, 1044898695889, 8782503978435, 73818042322837, 620449861007519, 5214958537443999, 43832377531943085, 368416605100242957
(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(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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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
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CROSSREFS
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Adjacent sequences: A125394 A125395 A125396 this_sequence A125398 A125399 A125400
Sequence in context: A001716 A028991 A102094 this_sequence A095249 A136659 A126965
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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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