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A022506
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Describe previous term from the right (method A - initial term is 0).
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20
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OFFSET
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0,2
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COMMENTS
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Method A = 'frequency' followed by 'digit'-indication.
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LINKS
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FORMULA
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EXAMPLE
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The term after 1011 is obtained by saying "two 1's, one 0, one 1", which gives 211011.
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MATHEMATICA
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a[0] = 0;
a[n_] := a[n] = Split[IntegerDigits[a[n-1]]] /. L_List /; IntegerQ[L[[1]]] :> {Length[L], L[[1]]} // Reverse // Flatten // FromDigits;
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PROG
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(Haskell)
a022506 n = a022506_list !! n
a022506_list = 0 : 10 : iterate (a045918 . a004086) 1011
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CROSSREFS
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KEYWORD
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nonn,base,easy,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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