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Search: id:A126491
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| A126491 |
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Number of base 23 n-digit numbers with adjacent digits differing by three or less. |
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+0
3
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| 1, 23, 149, 987, 6589, 44191, 297261, 2003755, 13527217, 91424701, 618430417, 4186027957, 28348547453, 192055244309, 1301515597555, 8822073211457, 59809085903049, 405528485035889, 2749918380375081, 18648854413662219
(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)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
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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]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
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CROSSREFS
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Cf. Base 23 differing by two or less A126410, one or less A126377.
Sequence in context: A055827 A142902 A125333 this_sequence A142044 A142935 A037068
Adjacent sequences: A126488 A126489 A126490 this_sequence A126492 A126493 A126494
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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 27 2006
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