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A126379
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Number of base 25 n-digit numbers with adjacent digits differing by one or less.
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4
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1, 25, 73, 215, 635, 1879, 5567, 16509, 48993, 145479, 432191, 1284481, 3818837, 11357069, 33784477, 100524263, 299168955, 890522631, 2651236335, 7894421265, 23510114133, 70023966177, 208589168433, 621421019043, 1851508693479
(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: A154050 A069190 A124718 * A114553 A098439 A044163
Adjacent sequences: A126376 A126377 A126378 * A126380 A126381 A126382
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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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