A120107 - cp's OEIS frontend

A120107 a(n) = Sum_{k=0..floor(n/2)} lcm(1,...,2(n-k)+2)/lcm(1,...,2k+2).

n	a(n)
0	1
1	6
2	31
3	425
4	1331
5	14084
6	182533
7	390855
8	6192220
9	117429752
10	136000866
11	2700408581
12	13835919839
13	42477252404
14	1171690228133
15	72397239805085
16	84274330442804
17	86644937313210
18	2686078920033439
19	3119346038772923

[1, 6, 31, 425, 1331, 14084, 182533, 390855, 6192220, 117429752, 136000866, 2700408581, 13835919839, 42477252404, 1171690228133, 72397239805085, 84274330442804, 86644937313210, 2686078920033439, 3119346038772923]

cp's OEIS Frontend

A120107 a(n) = Sum_{k=0..floor(n/2)} lcm(1,...,2(n-k)+2)/lcm(1,...,2k+2).

Table of values

List of values

cp's OEIS Frontend

A120107 a(n) = Sum_{k=0..floor(n/2)} lcm(1,...,2*(n-k)+2)/lcm(1,...,2*k+2).

Table of values

List of values

A120107 a(n) = Sum_{k=0..floor(n/2)} lcm(1,...,2(n-k)+2)/lcm(1,...,2k+2).