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Search: id:A126381
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| A126381 |
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Number of base 27 n-digit numbers with adjacent digits differing by one or less. |
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+0
5
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| 1, 27, 79, 233, 689, 2041, 6053, 17967, 53367, 158601, 471557, 1402579, 4173131, 12419951, 36973123, 110090201, 327866769, 976616073, 2909516661, 8669262243, 25834637067, 76997534979, 229509874839, 684183138261, 2039795051133
(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
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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: A044546 A121737 A124726 this_sequence A129254 A034033 A057609
Adjacent sequences: A126378 A126379 A126380 this_sequence A126382 A126383 A126384
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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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