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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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1
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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; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| [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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PROG
| (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
| Cf. Base 6 differing by two or less A126393, one or less A126360.
Sequence in context: A033132 A022023 A066534 * A127017 A152224 A152223
Adjacent sequences: A126471 A126472 A126473 * A126475 A126476 A126477
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 27 2006
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