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Search: id:A126539
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| A126539 |
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Number of base 18 n-digit numbers with adjacent digits differing by five or less. |
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+0
1
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| 1, 18, 168, 1628, 15938, 156652, 1541646, 15178334, 149460562, 1471805948, 14493780280, 142729983350, 1405560587628, 13841533266014, 136307239633698, 1342312628779666, 13218690669418640, 130173687322873468
(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 18 differing by four or less A126513, three or less A126486, two or less A126405, one or less A126372.
Sequence in context: A055915 A071539 A125381 this_sequence A139618 A010970 A126920
Adjacent sequences: A126536 A126537 A126538 this_sequence A126540 A126541 A126542
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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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