A064170 - cp's OEIS frontend

A064170 a(1) = 1; a(n+1) = product of numerator and denominator in Sum_{k=1..n} 1/a(k).

n	a(n)
1	1
2	1
3	2
4	10
5	65
6	442
7	3026
8	20737
9	142130
10	974170
11	6677057
12	45765226
13	313679522
14	2149991425
15	14736260450
16	101003831722
17	692290561601
18	4745030099482
19	32522920134770
20	222915410843905
21	1527884955772562
22	10472279279564026
23	71778070001175617
24	491974210728665290

[1, 1, 2, 10, 65, 442, 3026, 20737, 142130, 974170, 6677057, 45765226, 313679522, 2149991425, 14736260450, 101003831722, 692290561601, 4745030099482, 32522920134770, 222915410843905, 1527884955772562, 10472279279564026, 71778070001175617, 491974210728665290]

cp's OEIS Frontend

A064170 a(1) = 1; a(n+1) = product of numerator and denominator in Sum_{k=1..n} 1/a(k).

Table of values

List of values