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Search: id:A126473
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| A126473 |
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Number of base 5 n-digit numbers with adjacent digits differing by three or less. |
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+0
1
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| 1, 5, 23, 107, 497, 2309, 10727, 49835, 231521, 1075589, 4996919, 23214443, 107848529, 501037445, 2327695367, 10813893803, 50238661313, 233396326661, 1084301290583, 5037394142315, 23402480441009, 108722104190981
(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 5 differing by two or less A126392, one or less A126359.
Sequence in context: A107839 A128732 A026894 this_sequence A109877 A017974 A017975
Adjacent sequences: A126470 A126471 A126472 this_sequence A126474 A126475 A126476
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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 27 2006
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