A327697 - cp's OEIS frontend

A327697 Number of refinement sequences n -> ... -> {1}^n, where in each step every single part of a nonempty selection of parts is replaced by a partition of itself into smaller parts (in weakly decreasing order).

n	a(n)
1	1
2	1
3	2
4	7
5	22
6	122
7	598
8	4683
9	31148
10	292008
11	2560274
12	30122014
13	313694962
14	4189079688
15	53048837390
16	826150653479
17	11827659365138
18	204993767192252
19	3371451881544534
20	65337695492942258
21	1198123466804343518
22	25318312971995895392
23	516420623159289735874

[1, 1, 2, 7, 22, 122, 598, 4683, 31148, 292008, 2560274, 30122014, 313694962, 4189079688, 53048837390, 826150653479, 11827659365138, 204993767192252, 3371451881544534, 65337695492942258, 1198123466804343518, 25318312971995895392, 516420623159289735874]

cp's OEIS Frontend

A327697 Number of refinement sequences n -> ... -> {1}^n, where in each step every single part of a nonempty selection of parts is replaced by a partition of itself into smaller parts (in weakly decreasing order).

Table of values

List of values