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Search: id:A126415
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| A126415 |
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Number of base 28 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 28, 134, 650, 3168, 15486, 75848, 372024, 1826730, 8977530, 44151860, 217269760, 1069715430, 5268960200, 25962370558, 127969407686, 630947807506, 3111658441818, 15349331786976, 75731342285276, 373715745367376
(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)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2
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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]`-$[i+1]`>2)+($[i+1]`-$[i]`>2))
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CROSSREFS
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Cf. Base 28 differing by one or less A126382.
Sequence in context: A123376 A124956 A014705 this_sequence A074233 A050973 A095301
Adjacent sequences: A126412 A126413 A126414 this_sequence A126416 A126417 A126418
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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 28 2006
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