A111930 - cp's OEIS frontend

A111930 Denominator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).

n	a(n)
1	1
2	4
3	12
4	48
5	240
6	240
7	1680
8	6720
9	20160
10	4032
11	44352
12	44352
13	576576
14	576576
15	2882880
16	11531520
17	196035840
18	196035840
19	3724680960
20	3724680960
21	3724680960
22	3724680960
23	85667662080
24	85667662080
25	428338310400
26	428338310400

[1, 4, 12, 48, 240, 240, 1680, 6720, 20160, 4032, 44352, 44352, 576576, 576576, 2882880, 11531520, 196035840, 196035840, 3724680960, 3724680960, 3724680960, 3724680960, 85667662080, 85667662080, 428338310400, 428338310400]

cp's OEIS Frontend

A111930 Denominator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).

Table of values

List of values