A353250 - cp's OEIS frontend

A353250 a(0) = 1, a(n) = harmonic_mean(a(n-1), n), where harmonic_mean(p, q) = 2/(1/p + 1/q); numerators.

n	a(n)
0	1
1	1
2	4
3	24
4	48
5	480
6	960
7	13440
8	26880
9	161280
10	322560
11	7096320
12	14192640
13	369008640
14	738017280
15	295206912
16	590413824
17	20074070016
18	40148140032
19	1525629321216
20	15256293212160
21	30512586424320
22	61025172848640
23	2807157951037440
24	5614315902074880

[1, 1, 4, 24, 48, 480, 960, 13440, 26880, 161280, 322560, 7096320, 14192640, 369008640, 738017280, 295206912, 590413824, 20074070016, 40148140032, 1525629321216, 15256293212160, 30512586424320, 61025172848640, 2807157951037440, 5614315902074880]

cp's OEIS Frontend

A353250 a(0) = 1, a(n) = harmonic_mean(a(n-1), n), where harmonic_mean(p, q) = 2/(1/p + 1/q); numerators.

Table of values

List of values