A327699 - cp's OEIS frontend

A327699 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 two smaller parts (in weakly decreasing order).

n	a(n)
1	1
2	1
3	1
4	4
5	9
6	48
7	211
8	1736
9	9777
10	91169
11	739174
12	8613817
13	83763730
14	1105436491
15	13222076337
16	207852246589
17	2789691577561
18	47759515531854
19	755158220565169
20	14595210284816038
21	255814560447492788
22	5373613110108953192
23	105867623217924984398
24	2460702471446564481641

[1, 1, 1, 4, 9, 48, 211, 1736, 9777, 91169, 739174, 8613817, 83763730, 1105436491, 13222076337, 207852246589, 2789691577561, 47759515531854, 755158220565169, 14595210284816038, 255814560447492788, 5373613110108953192, 105867623217924984398, 2460702471446564481641]

cp's OEIS Frontend

A327699 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 two smaller parts (in weakly decreasing order).

Table of values

List of values