Maximal nonempty {1,3}-chunks of a 4-day-old string in a "Look and Say" sequence.

Terms

a(0) =1a(1) =3a(2) =11a(3) =13a(4) =31a(5) =111a(6) =113a(7) =131a(8) =133a(9) =311a(10) =1113a(11) =1131a(12) =1133a(13) =1311a(14) =1331a(15) =3111a(16) =3113a(17) =11131a(18) =11133a(19) =11311a(20) =11331a(21) =13111a(22) =13113a(23) =13311a(24) =31131a(25) =31133a(26) =111311a(27) =111331a(28) =113111a(29) =113311