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Describe all the previous terms (previous terms are concatenated into one large integer; method - digit-indication followed by frequency, initial term is 1).
1

%I #4 May 01 2021 06:50:28

%S 1,11,13,1431,143111413111,14311141311241311341113113,

%T 14311141311241311341113114413113411131122141113112314113311231

%N Describe all the previous terms (previous terms are concatenated into one large integer; method - digit-indication followed by frequency, initial term is 1).

%C The next term is too large to include.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/LookandSaySequence.html">Look and Say Sequence</a>

%e a(4) is obtained by saying "1 four times, 3 once", which gives 1431.

%Y Cf. A005150, A007651, A045981, A045982, A060857, A343837.

%K nonn,base,easy

%O 1,2

%A _Ilya Gutkovskiy_, May 01 2021