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Search: id:A125353
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| A125353 |
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Number of base 16 circular n-digit numbers with adjacent digits differing by 4 or less. |
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+0
1
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| 1, 16, 124, 796, 5924, 44916, 348652, 2743036, 21801764, 174565444, 1405459324, 11362215276, 92138276228, 748875775404, 6097017988948, 49701864868956, 405539673414148, 3311264043438796, 27050524930821556, 221065493126829404
(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)+A025014(n+1) for base>=4.int(n/2)+1
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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]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))
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CROSSREFS
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Adjacent sequences: A125350 A125351 A125352 this_sequence A125354 A125355 A125356
Sequence in context: A030508 A006215 A060633 this_sequence A126511 A067442 A000485
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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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