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Search: id:A125416
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| A125416 |
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Number of base 28 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 28, 322, 3010, 32830, 364658, 4147612, 47830608, 557530518, 6551280562, 77467665302, 920625665702, 10984613101924, 131489273810104, 1578096648395736, 18980188700616500, 228674496511259030
(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: A107942 A042520 A022688 this_sequence A055753 A027820 A092713
Adjacent sequences: A125413 A125414 A125415 this_sequence A125417 A125418 A125419
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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