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Search: id:A125425
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| A125425 |
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Number of base 13 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 13, 139, 1357, 14591, 158703, 1735537, 19008065, 208287079, 2282738371, 25019137619, 274217831395, 3005531920793, 32941830915539, 361055827137585, 3957318988935327, 43373831073632999, 475394897638619787
(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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Sequence in context: A023301 A023329 A142896 this_sequence A016145 A064103 A051639
Adjacent sequences: A125422 A125423 A125424 this_sequence A125426 A125427 A125428
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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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