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Search: id:A125424
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| A125424 |
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Number of base 12 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 12, 124, 1188, 12356, 129492, 1361746, 14331126, 150856188, 1588078260, 16718137334, 175997231290, 1852781990558, 19504865161846, 205334357806520, 2161624764528348, 22756160755947020, 239561861905201388
(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: A074158 A071269 A061088 this_sequence A163147 A120918 A039680
Adjacent sequences: A125421 A125422 A125423 this_sequence A125425 A125426 A125427
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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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