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Search: id:A125430
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| A125430 |
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Number of base 18 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 18, 214, 2202, 25862, 310258, 3787948, 46645456, 577150510, 7159272162, 88927443434, 1105386497794, 13745406254372, 170957599435056, 2126500579257954, 26452521788330842, 329064936891773982
(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(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
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CROSSREFS
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Adjacent sequences: A125427 A125428 A125429 this_sequence A125431 A125432 A125433
Sequence in context: A025937 A021804 A025932 this_sequence A021764 A059357 A009470
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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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