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Search: id:A126541
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| A126541 |
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Number of base 20 n-digit numbers with adjacent digits differing by five or less. |
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+0
1
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| 1, 20, 190, 1870, 18600, 185922, 1862204, 18667904, 187205534, 1877615174, 18833087302, 188906865160, 1894866747430, 19006912484080, 190653725780160, 1912402757442222, 19182869344924714, 192418948095124214
(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 20 differing by four or less A126515, three or less A126488, two or less A126407, one or less A126374.
Sequence in context: A022615 A061180 A125383 this_sequence A027716 A126901 A008420
Adjacent sequences: A126538 A126539 A126540 this_sequence A126542 A126543 A126544
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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