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A126380
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Number of base 26 n-digit numbers with adjacent digits differing by one or less.
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4
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1, 26, 76, 224, 662, 1960, 5810, 17238, 51180, 152040, 451874, 1343530, 3995984, 11888510, 35378800, 105307232, 313517862, 933569352, 2780376498, 8281841754, 24672375600, 73510750578, 219049521636, 652802078652, 1945651872306
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| [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
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PROG
| (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
| Sequence in context: A044545 A139698 A124719 * A083578 A173307 A042326
Adjacent sequences: A126377 A126378 A126379 * A126381 A126382 A126383
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 26 2006
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