A181482 - cp's OEIS frontend

A181482 The sum of the first n integers, with every third integer taken negative.

n	a(n)
1	1
2	3
3	0
4	4
5	9
6	3
7	10
8	18
9	9
10	19
11	30
12	18
13	31
14	45
15	30
16	46
17	63
18	45
19	64
20	84
21	63
22	85
23	108
24	84
25	109
26	135
27	108
28	136
29	165
30	135
31	166
32	198
33	165
34	199
35	234
36	198
37	235
38	273
39	234
40	274
41	315
42	273
43	316
44	360
45	315
46	361
47	408
48	360
49	409
50	459
51	408
52	460
53	513
54	459
55	514
56	570
57	513
58	571
59	630

[1, 3, 0, 4, 9, 3, 10, 18, 9, 19, 30, 18, 31, 45, 30, 46, 63, 45, 64, 84, 63, 85, 108, 84, 109, 135, 108, 136, 165, 135, 166, 198, 165, 199, 234, 198, 235, 273, 234, 274, 315, 273, 316, 360, 315, 361, 408, 360, 409, 459, 408, 460, 513, 459, 514, 570, 513, 571, 630]

cp's OEIS Frontend

A181482 The sum of the first n integers, with every third integer taken negative.

Table of values

List of values

n	a(n)
1	1
2	3
3	0
4	4
5	9
6	3
7	10
8	18
9	9
10	19
11	30
12	18
13	31
14	45
15	30
16	46
17	63
18	45
19	64
20	84
21	63
22	85
23	108
24	84
25	109
26	135
27	108
28	136
29	165
30	135
31	166
32	198
33	165
34	199
35	234
36	198
37	235
38	273
39	234
40	274
41	315
42	273
43	316
44	360
45	315
46	361
47	408
48	360
49	409
50	459
51	408
52	460
53	513
54	459
55	514
56	570
57	513
58	571
59	630

n	a(n)
1	1
2	3
3	0
4	4
5	9
6	3
7	10
8	18
9	9
10	19
11	30
12	18
13	31
14	45
15	30
16	46
17	63
18	45
19	64
20	84
21	63
22	85
23	108
24	84
25	109
26	135
27	108
28	136
29	165
30	135
31	166
32	198
33	165
34	199
35	234
36	198
37	235
38	273
39	234
40	274
41	315
42	273
43	316
44	360
45	315
46	361
47	408
48	360
49	409
50	459
51	408
52	460
53	513
54	459
55	514
56	570
57	513
58	571
59	630

n	a(n)
1	1
2	3
3	0
4	4
5	9
6	3
7	10
8	18
9	9
10	19
11	30
12	18
13	31
14	45
15	30
16	46
17	63
18	45
19	64
20	84
21	63
22	85
23	108
24	84
25	109
26	135
27	108
28	136
29	165
30	135
31	166
32	198
33	165
34	199
35	234
36	198
37	235
38	273
39	234
40	274
41	315
42	273
43	316
44	360
45	315
46	361
47	408
48	360
49	409
50	459
51	408
52	460
53	513
54	459
55	514
56	570
57	513
58	571
59	630