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Search: id:A126361
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| A126361 |
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Number of base 7 n-digit numbers with adjacent digits differing by one or less. |
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+0
5
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| 1, 7, 19, 53, 149, 421, 1193, 3387, 9627, 27383, 77923, 221805, 631469, 1797957, 5119593, 14578387, 41514003, 118218823, 336653331, 958698053, 2730124261, 7774706437, 22140438345, 63050541515, 179552587883, 511322221559
(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)+3^(n-1) for base>=n; a(base,n)=a(base-1,n)+3^(n-1)-2 when base=n-1
Closely related to A002714. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 15 2008
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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>1)+($[i+1]`-$[i]`>1))
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CROSSREFS
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Sequence in context: A092053 A072630 A002714 this_sequence A069005 A000413 A155335
Adjacent sequences: A126358 A126359 A126360 this_sequence A126362 A126363 A126364
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KEYWORD
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nonn,base
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 26 2006
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