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Search: id:A126487
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| A126487 |
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Number of base 19 n-digit numbers with adjacent digits differing by three or less. |
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+0
3
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| 1, 19, 121, 791, 5217, 34587, 230033, 1533159, 10233063, 68367029, 457062389, 3057032825, 20453043685, 136869404619, 916044100681, 6131521065627, 41043887722493, 274756556545945, 1839334652522085, 12313523619477007
(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 19 differing by two or less A126406, one or less A126373.
Sequence in context: A044732 A070302 A125329 this_sequence A109669 A142106 A078851
Adjacent sequences: A126484 A126485 A126486 this_sequence A126488 A126489 A126490
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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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