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Search: id:A125415
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| A125415 |
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Number of base 27 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 27, 309, 2883, 31361, 347507, 3942849, 45357283, 527368217, 6180793077, 72890540049, 863812188167, 10276686529385, 122640156381419, 1467200048583879, 17587676571419633, 211163124573990697
(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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Sequence in context: A022687 A083813 A086574 this_sequence A119295 A048396 A061181
Adjacent sequences: A125412 A125413 A125414 this_sequence A125416 A125417 A125418
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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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