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Search: id:A125443
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| A125443 |
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Number of base 31 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 31, 409, 4399, 55177, 705211, 9228145, 122435659, 1641825097, 22192435141, 301837475369, 4125290661105, 56599464923761, 778943329190005, 10746475355730103, 148551954418570669, 2056701047801775993
(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: A125440 A125441 A125442 this_sequence A125444 A125445 A125446
Sequence in context: A091348 A142829 A022691 this_sequence A069582 A089375 A068658
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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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