Length of n-th term in Look and Say sequences A005150 and A007651.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =6a(5) =6a(6) =8a(7) =10a(8) =14a(9) =20a(10) =26a(11) =34a(12) =46a(13) =62a(14) =78a(15) =102a(16) =134a(17) =176a(18) =226a(19) =302a(20) =408a(21) =528a(22) =678a(23) =904a(24) =1182a(25) =1540a(26) =2012a(27) =2606a(28) =3410a(29) =4462