A327643 - cp's OEIS frontend

A327643 Number of refinement sequences n -> ... -> {1}^n, where in each step one part is replaced by a partition of itself into two smaller parts (in weakly decreasing order).

n	a(n)
1	1
2	1
3	1
4	3
5	6
6	24
7	84
8	498
9	2220
10	15108
11	92328
12	773580
13	5636460
14	53563476
15	471562512
16	5270698716
17	52117937052
18	637276396764
19	7317811499736
20	100453675122444
21	1276319138168796
22	19048874583061716
23	270233458572751440
24	4442429353548965628
25	68384217440167826412

[1, 1, 1, 3, 6, 24, 84, 498, 2220, 15108, 92328, 773580, 5636460, 53563476, 471562512, 5270698716, 52117937052, 637276396764, 7317811499736, 100453675122444, 1276319138168796, 19048874583061716, 270233458572751440, 4442429353548965628, 68384217440167826412]

cp's OEIS Frontend

A327643 Number of refinement sequences n -> ... -> {1}^n, where in each step one part is replaced by a partition of itself into two smaller parts (in weakly decreasing order).

Table of values

List of values