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Look and Say Sequence
Sequence description
each term describes the previous term
Sequence terms
1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, ...
Table program
FromDigits /@ NestList[Flatten[Reverse /@ (Through[{First, Length}[#1]] &) /@ Split[#]] &, {1}, n-1]
Plot