A001670 - cp's OEIS frontend

A001670 k appears k times (k even).

n	a(n)
1	2
2	2
3	4
4	4
5	4
6	4
7	6
8	6
9	6
10	6
11	6
12	6
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	10
22	10
23	10
24	10
25	10
26	10
27	10
28	10
29	10
30	10
31	12
32	12
33	12
34	12
35	12
36	12
37	12
38	12
39	12
40	12
41	12
42	12
43	14
44	14
45	14
46	14
47	14
48	14
49	14
50	14
51	14
52	14
53	14
54	14
55	14
56	14
57	16
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	16
66	16
67	16
68	16
69	16
70	16

[2, 2, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16]

cp's OEIS Frontend

A001670 k appears k times (k even).

Table of values

List of values

n	a(n)
1	2
2	2
3	4
4	4
5	4
6	4
7	6
8	6
9	6
10	6
11	6
12	6
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	10
22	10
23	10
24	10
25	10
26	10
27	10
28	10
29	10
30	10
31	12
32	12
33	12
34	12
35	12
36	12
37	12
38	12
39	12
40	12
41	12
42	12
43	14
44	14
45	14
46	14
47	14
48	14
49	14
50	14
51	14
52	14
53	14
54	14
55	14
56	14
57	16
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	16
66	16
67	16
68	16
69	16
70	16

n	a(n)
1	2
2	2
3	4
4	4
5	4
6	4
7	6
8	6
9	6
10	6
11	6
12	6
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	10
22	10
23	10
24	10
25	10
26	10
27	10
28	10
29	10
30	10
31	12
32	12
33	12
34	12
35	12
36	12
37	12
38	12
39	12
40	12
41	12
42	12
43	14
44	14
45	14
46	14
47	14
48	14
49	14
50	14
51	14
52	14
53	14
54	14
55	14
56	14
57	16
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	16
66	16
67	16
68	16
69	16
70	16

n	a(n)
1	2
2	2
3	4
4	4
5	4
6	4
7	6
8	6
9	6
10	6
11	6
12	6
13	8
14	8
15	8
16	8
17	8
18	8
19	8
20	8
21	10
22	10
23	10
24	10
25	10
26	10
27	10
28	10
29	10
30	10
31	12
32	12
33	12
34	12
35	12
36	12
37	12
38	12
39	12
40	12
41	12
42	12
43	14
44	14
45	14
46	14
47	14
48	14
49	14
50	14
51	14
52	14
53	14
54	14
55	14
56	14
57	16
58	16
59	16
60	16
61	16
62	16
63	16
64	16
65	16
66	16
67	16
68	16
69	16
70	16