132112 Each number describes, in numbers, the previous number. If that makes sense.

This particular on goes up to 20 lines... I think I lost my mind. 1 11 21 1211 111221 312211 13112221 1113213211 31131211131221 13211311123113112211 11131221133112132113212221 3113112221232112111312211312113211 1321132132111213122112311311222113111221131221 11131221131211131231121113112221121321132132211331222113112211 311311222113111231131112132112311321322112111312211312111322212311322113212221 1321132132211331121321133112111312211213211312111322211231131122211311123113321213211322211312113211 111312211312111322212321121113122123211231131122211213122113111231133221121321132132211331121321231211121113122113322113111221131221 311311222113111231133211121312211231131122111213122112132113213221121113112221133112132123222112111312211312111322212321121113121112131112311231131122212322211331222113112211 1321132132211331121321231231121113112221121321132122311211131122211211131221131211132221123113213221232112111312111213322112311311222113111231133211121312211231131112311213311221121321132132111213213211121332212311322113212221 111312211312111322212321121113121112131112132112311322322112111312211312112213211231132132211231131122211311123113322112132113121113221112131221123113111231121123222112132113213221133112132123123112111311222112132113311213211211232122211211131221131211131231121113121113123112112322121213211322211312113211

How funny, solving a riddle is such a great feeling of satisfaction and accomplishment. : )