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Search: id:A126474
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| A126474 |
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Number of base 6 n-digit numbers with adjacent digits differing by three or less. |
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+0
2
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| 1, 6, 30, 154, 788, 4034, 20650, 105708, 541122, 2770018, 14179796, 72586754, 371573530, 1902094812, 9736874082, 49843318162, 255149275268, 1306115946338, 6686042370634, 34226029248972, 175203956722818
(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 6 differing by two or less A126393, one or less A126360.
Sequence in context: A033132 A022023 A066534 this_sequence A127017 A152223 A152224
Adjacent sequences: A126471 A126472 A126473 this_sequence A126475 A126476 A126477
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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 27 2006
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