A319674 - cp's OEIS frontend

A319674 a(n) = 1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 + 9 - 10 - 11 - 12 + ... - (up to n).

n	a(n)
1	1
2	3
3	6
4	2
5	-3
6	-9
7	-2
8	6
9	15
10	5
11	-6
12	-18
13	-5
14	9
15	24
16	8
17	-9
18	-27
19	-8
20	12
21	33
22	11
23	-12
24	-36
25	-11
26	15
27	42
28	14
29	-15
30	-45
31	-14
32	18
33	51
34	17
35	-18
36	-54
37	-17
38	21
39	60
40	20
41	-21
42	-63
43	-20
44	24
45	69
46	23
47	-24
48	-72
49	-23
50	27
51	78
52	26
53	-27
54	-81
55	-26
56	30
57	87
58	29
59	-30
60	-90
61	-29

[1, 3, 6, 2, -3, -9, -2, 6, 15, 5, -6, -18, -5, 9, 24, 8, -9, -27, -8, 12, 33, 11, -12, -36, -11, 15, 42, 14, -15, -45, -14, 18, 51, 17, -18, -54, -17, 21, 60, 20, -21, -63, -20, 24, 69, 23, -24, -72, -23, 27, 78, 26, -27, -81, -26, 30, 87, 29, -30, -90, -29]

cp's OEIS Frontend

A319674 a(n) = 1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 + 9 - 10 - 11 - 12 + ... - (up to n).

Table of values

List of values

n	a(n)
1	1
2	3
3	6
4	2
5	-3
6	-9
7	-2
8	6
9	15
10	5
11	-6
12	-18
13	-5
14	9
15	24
16	8
17	-9
18	-27
19	-8
20	12
21	33
22	11
23	-12
24	-36
25	-11
26	15
27	42
28	14
29	-15
30	-45
31	-14
32	18
33	51
34	17
35	-18
36	-54
37	-17
38	21
39	60
40	20
41	-21
42	-63
43	-20
44	24
45	69
46	23
47	-24
48	-72
49	-23
50	27
51	78
52	26
53	-27
54	-81
55	-26
56	30
57	87
58	29
59	-30
60	-90
61	-29

n	a(n)
1	1
2	3
3	6
4	2
5	-3
6	-9
7	-2
8	6
9	15
10	5
11	-6
12	-18
13	-5
14	9
15	24
16	8
17	-9
18	-27
19	-8
20	12
21	33
22	11
23	-12
24	-36
25	-11
26	15
27	42
28	14
29	-15
30	-45
31	-14
32	18
33	51
34	17
35	-18
36	-54
37	-17
38	21
39	60
40	20
41	-21
42	-63
43	-20
44	24
45	69
46	23
47	-24
48	-72
49	-23
50	27
51	78
52	26
53	-27
54	-81
55	-26
56	30
57	87
58	29
59	-30
60	-90
61	-29

n	a(n)
1	1
2	3
3	6
4	2
5	-3
6	-9
7	-2
8	6
9	15
10	5
11	-6
12	-18
13	-5
14	9
15	24
16	8
17	-9
18	-27
19	-8
20	12
21	33
22	11
23	-12
24	-36
25	-11
26	15
27	42
28	14
29	-15
30	-45
31	-14
32	18
33	51
34	17
35	-18
36	-54
37	-17
38	21
39	60
40	20
41	-21
42	-63
43	-20
44	24
45	69
46	23
47	-24
48	-72
49	-23
50	27
51	78
52	26
53	-27
54	-81
55	-26
56	30
57	87
58	29
59	-30
60	-90
61	-29