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A126518
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Number of base 23 n-digit numbers with adjacent digits differing by four or less.
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1
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1, 23, 187, 1563, 13187, 111855, 951843, 8116589, 69304469, 592275463, 5064405547, 43320119881, 370639572699, 3171604704237, 27142404725961, 232297572817893, 1988192727095313, 17017021355308651, 145651801767851231
(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 23 differing by three or less A126491, two or less A126410, one or less A126377.
Sequence in context: A302200 A269072 A125360 * A167467 A129052 A201859
Adjacent sequences: A126515 A126516 A126517 * A126519 A126520 A126521
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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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