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A126522
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Number of base 27 n-digit numbers with adjacent digits differing by four or less.
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1
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1, 27, 223, 1887, 16103, 138099, 1188039, 10242351, 88435341, 764407997, 6612526647, 57234605067, 495599614141, 4292742043159, 37190688714579, 322257543592553, 2792687844075253, 24203507849388273, 209778422093025849
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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[Empirical] a(base,n)=a(base-1,n)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4
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LINKS
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Table of n, a(n) for n=0..18.
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PROG
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))
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CROSSREFS
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Cf. Base 27 differing by three or less A126495, two or less A126414, one or less A126381.
Sequence in context: A160441 A222994 A125364 * A273822 A027500 A069979
Adjacent sequences: A126519 A126520 A126521 * A126523 A126524 A126525
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KEYWORD
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nonn,base
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AUTHOR
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R. H. Hardin, Dec 28 2006
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STATUS
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approved
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