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Search: id:A126530
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| A126530 |
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Number of base 9 n-digit numbers with adjacent digits differing by five or less. |
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+0
1
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| 1, 9, 69, 541, 4231, 33101, 258953, 2025831, 15848391, 123984439, 969949627, 7588067405, 59362636295, 464403174075, 3633098554089, 28422297349753, 222352070721709, 1739494972761653, 13608340819322255, 106460175369651261
(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)+11^(n-1) for base>=5n-4; a(base,n)=a(base-1,n)+11^(n-1)-2 when base=5n-5
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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]`-$[i+1]`>5)+($[i+1]`-$[i]`>5))
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CROSSREFS
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Cf. Base 9 differing by four or less A126504, three or less A126477, two or less A126396, one or less A126363.
Sequence in context: A125372 A075045 A081616 this_sequence A110202 A110201 A045739
Adjacent sequences: A126527 A126528 A126529 this_sequence A126531 A126532 A126533
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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