A327698 - cp's OEIS frontend

A327698 Number of refinement sequences n -> ... -> {1}^n, where in each step exactly one part is replaced by a partition of itself into smaller parts (in weakly decreasing order).

n	a(n)
1	1
2	1
3	2
4	6
5	17
6	74
7	300
8	1755
9	9360
10	65510
11	442117
12	3802889
13	30213386
14	294892947
15	2789021105
16	31360525517
17	334374848070
18	4184958056248
19	50606351991305
20	704124800141153
21	9452367941048830
22	143309007303310536
23	2124982437997726705
24	35389562541842450218

[1, 1, 2, 6, 17, 74, 300, 1755, 9360, 65510, 442117, 3802889, 30213386, 294892947, 2789021105, 31360525517, 334374848070, 4184958056248, 50606351991305, 704124800141153, 9452367941048830, 143309007303310536, 2124982437997726705, 35389562541842450218]

cp's OEIS Frontend

A327698 Number of refinement sequences n -> ... -> {1}^n, where in each step exactly one part is replaced by a partition of itself into smaller parts (in weakly decreasing order).

Table of values

List of values