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Search: id:A126508
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| A126508 |
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Number of base 13 n-digit numbers with adjacent digits differing by four or less. |
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+0
2
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| 1, 13, 97, 753, 5897, 46287, 363509, 2855151, 22426249, 176152007, 1383628073, 10868042671, 85365689641, 670525630751, 5266807148873, 41369421713583, 324946216030489, 2552369333410047, 20048207650685929, 157473538310505327
(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)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4
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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]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))
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CROSSREFS
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Cf. Base 13 differing by three or less A126481, two or less A126400, one or less A126367.
Adjacent sequences: A126505 A126506 A126507 this_sequence A126509 A126510 A126511
Sequence in context: A141894 A125350 A049294 this_sequence A075899 A006976 A034270
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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