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Search: id:A126494
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| A126494 |
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Number of base 26 n-digit numbers with adjacent digits differing by three or less. |
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+0
3
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| 1, 26, 170, 1134, 7618, 51394, 347682, 2356702, 15997846, 108719102, 739490656, 5033426494, 34279838804, 233566488998, 1591993821168, 10854281793638, 74022763799812, 504910336091974, 3444546058508588, 23502038289723148
(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 26 differing by two or less A126413, one or less A126380.
Sequence in context: A037052 A156339 A125336 this_sequence A027001 A042312 A090960
Adjacent sequences: A126491 A126492 A126493 this_sequence A126495 A126496 A126497
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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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