A255368 - cp's OEIS frontend

A255368 a(n) = -(-1)^n * 2 * n / 3 if n divisible by 3, a(n) = -(-1)^n * n otherwise.

n	a(n)
0	0
1	1
2	-2
3	2
4	-4
5	5
6	-4
7	7
8	-8
9	6
10	-10
11	11
12	-8
13	13
14	-14
15	10
16	-16
17	17
18	-12
19	19
20	-20
21	14
22	-22
23	23
24	-16
25	25
26	-26
27	18
28	-28
29	29
30	-20
31	31
32	-32
33	22
34	-34
35	35
36	-24
37	37
38	-38
39	26
40	-40
41	41
42	-28
43	43
44	-44
45	30
46	-46
47	47
48	-32
49	49
50	-50
51	34
52	-52
53	53
54	-36
55	55
56	-56
57	38
58	-58
59	59

[0, 1, -2, 2, -4, 5, -4, 7, -8, 6, -10, 11, -8, 13, -14, 10, -16, 17, -12, 19, -20, 14, -22, 23, -16, 25, -26, 18, -28, 29, -20, 31, -32, 22, -34, 35, -24, 37, -38, 26, -40, 41, -28, 43, -44, 30, -46, 47, -32, 49, -50, 34, -52, 53, -36, 55, -56, 38, -58, 59]

cp's OEIS Frontend

A255368 a(n) = -(-1)^n * 2 * n / 3 if n divisible by 3, a(n) = -(-1)^n * n otherwise.

Table of values

List of values

n	a(n)
0	0
1	1
2	-2
3	2
4	-4
5	5
6	-4
7	7
8	-8
9	6
10	-10
11	11
12	-8
13	13
14	-14
15	10
16	-16
17	17
18	-12
19	19
20	-20
21	14
22	-22
23	23
24	-16
25	25
26	-26
27	18
28	-28
29	29
30	-20
31	31
32	-32
33	22
34	-34
35	35
36	-24
37	37
38	-38
39	26
40	-40
41	41
42	-28
43	43
44	-44
45	30
46	-46
47	47
48	-32
49	49
50	-50
51	34
52	-52
53	53
54	-36
55	55
56	-56
57	38
58	-58
59	59

n	a(n)
0	0
1	1
2	-2
3	2
4	-4
5	5
6	-4
7	7
8	-8
9	6
10	-10
11	11
12	-8
13	13
14	-14
15	10
16	-16
17	17
18	-12
19	19
20	-20
21	14
22	-22
23	23
24	-16
25	25
26	-26
27	18
28	-28
29	29
30	-20
31	31
32	-32
33	22
34	-34
35	35
36	-24
37	37
38	-38
39	26
40	-40
41	41
42	-28
43	43
44	-44
45	30
46	-46
47	47
48	-32
49	49
50	-50
51	34
52	-52
53	53
54	-36
55	55
56	-56
57	38
58	-58
59	59

n	a(n)
0	0
1	1
2	-2
3	2
4	-4
5	5
6	-4
7	7
8	-8
9	6
10	-10
11	11
12	-8
13	13
14	-14
15	10
16	-16
17	17
18	-12
19	19
20	-20
21	14
22	-22
23	23
24	-16
25	25
26	-26
27	18
28	-28
29	29
30	-20
31	31
32	-32
33	22
34	-34
35	35
36	-24
37	37
38	-38
39	26
40	-40
41	41
42	-28
43	43
44	-44
45	30
46	-46
47	47
48	-32
49	49
50	-50
51	34
52	-52
53	53
54	-36
55	55
56	-56
57	38
58	-58
59	59