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Search: id:A126413
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| A126413 |
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Number of base 26 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 26, 124, 600, 2918, 14236, 69598, 340774, 1670480, 8196280, 40245610, 197738510, 972059180, 4780678950, 23520964308, 115762376468, 569912653284, 2806482718416, 13823453975028, 68101963757630, 335568968553598
(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 26 differing by one or less A126380.
Sequence in context: A051729 A100163 A124954 this_sequence A044358 A044739 A166831
Adjacent sequences: A126410 A126411 A126412 this_sequence A126414 A126415 A126416
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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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