A007890 Summarize the previous term! (in decreasing order).

1, 11, 21, 1211, 1231, 131221, 132231, 232221, 134211, 14131231, 14231241, 24132231, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221, 14233221

Offset: 1

Author

Mira Bernstein

Keywords

• nonn
• base
• easy

Examples

			For example, the term after 131221 is obtained by saying "one 3, two 2's, three 1's", which gives 13-22-31, i.e. 132231.
		

Links

• Onno M. Cain, Sela T. Enin, Inventory Loops (i.e. Counting Sequences) have Pre-period 2 max S_1 + 60, arXiv:2004.00209 [math.NT], 2020.

Crossrefs

Cf. A005150, A034003, A036058, A244112.

Programs

Mathematica

Nest[Append[#, FromDigits@ Flatten@ Map[Reverse, Tally@ ReverseSort@ IntegerDigits@ #[[-1]] ] ] &, {1}, 24] (* Michael De Vlieger, Jul 15 2020 *)

Formula

From Seiichi Manyama, Aug 18 2020: (Start)

a(1) = 1 and a(n) = A244112(a(n-1)) for n > 1.

a(n) = 14233221 for n >= 13. (End)