A323477 Successive generations of A306211, in compressed notation.

1, 11, 112, 11221, 11221221, 1122122122121, 1122122122121221212111, 1122122122121221212111221212111211113, 1122122122121221212111221212111211113221212111211113211113141

Offset: 1

Author

N. J. A. Sloane, Jan 31 2019

Keywords

• nonn
• base

Comments

"Compressed" means the separating commas have been omitted. This will only work as long as the terms of A306211 are at most 9. However, we know from Chaffin's work (see A306211) that this is true at least for the first 10228800161220 terms of A306211.

Crossrefs

Cf. A306211, A306215 (lengths), A323478 (increments).

Programs

Mathematica

s[n_] := If[n == 1, {1}, s[n] = Join[s[n-1], Length /@ Split[s[n-1]]]];
a[n_] := FromDigits[s[n]];
Array[a, 9] (* Jean-François Alcover, Feb 24 2021 *)