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Search: id:A126400
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| A126400 |
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Number of base 13 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 13, 59, 275, 1293, 6111, 28973, 137649, 654857, 3118273, 14857419, 70818391, 337647601, 1610116861, 7678944363, 36625115213, 174694226717, 833283367207, 3974811512311, 18960367898651, 90444302124667, 431438069091899
(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)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2
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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]`-$[i+1]`>2)+($[i+1]`-$[i]`>2))
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CROSSREFS
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Cf. Base 13 differing by one or less A126367.
Sequence in context: A141917 A163833 A124864 this_sequence A146764 A145474 A002647
Adjacent sequences: A126397 A126398 A126399 this_sequence A126401 A126402 A126403
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KEYWORD
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nonn,base
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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