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A126405
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Number of base 18 n-digit numbers with adjacent digits differing by two or less.
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3
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1, 18, 84, 400, 1918, 9236, 44598, 215774, 1045480, 5071280, 24620610, 119613534, 581435182, 2827574694, 13755641338, 66937791112, 325807794512, 1586104016732, 7722649252978, 37605625036546, 183139080847344
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| [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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PROG
| (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
| Cf. Base 18 differing by one or less A126372.
Sequence in context: A043961 A067984 A124935 * A141842 A063788 A066854
Adjacent sequences: A126402 A126403 A126404 * A126406 A126407 A126408
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006
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