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Search: id:A126514
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| A126514 |
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Number of base 19 n-digit numbers with adjacent digits differing by four or less. |
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+0
2
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| 1, 19, 151, 1239, 10271, 85611, 715649, 5991499, 50202083, 420816645, 3528266989, 29585656541, 248100670697, 2080601208199, 17448464481771, 146328696766445, 1227167540644629, 10291514720245361, 86308846158006385
(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 19 differing by three or less A126487, two or less A126406, one or less A126373.
Sequence in context: A125356 A066668 A111884 this_sequence A010825 A022711 A107891
Adjacent sequences: A126511 A126512 A126513 this_sequence A126515 A126516 A126517
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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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