A274660 - cp's OEIS frontend

A274660 Irregular triangle read by rows in which row n lists the divisors d of 2*n+1 (A274658), given the sign (-1)^(n + (d-1)/2).

n	a(n)
0	1
1	-1
2	3
3	1
4	5
5	-1
6	7
7	1
8	-3
9	9
10	-1
11	11
12	1
13	13
14	-1
15	3
16	-5
17	15
18	1
19	17
20	-1
21	19
22	1
23	-3
24	-7
25	21
26	-1
27	23
28	1
29	5
30	25
31	-1
32	3
33	-9
34	27
35	1
36	29
37	-1
38	31
39	1
40	-3
41	-11
42	33
43	-1
44	-5
45	7
46	35
47	1
48	37
49	-1
50	3
51	-13
52	39
53	1
54	41
55	-1
56	43
57	1
58	-3
59	5
60	9
61	-15
62	45
63	-1
64	47
65	1
66	-7
67	49
68	-1
69	3
70	-17
71	51
72	1
73	53
74	-1
75	-5
76	11
77	55
78	1
79	-3
80	-19
81	57
82	-1
83	59
84	1
85	61

[1, -1, 3, 1, 5, -1, 7, 1, -3, 9, -1, 11, 1, 13, -1, 3, -5, 15, 1, 17, -1, 19, 1, -3, -7, 21, -1, 23, 1, 5, 25, -1, 3, -9, 27, 1, 29, -1, 31, 1, -3, -11, 33, -1, -5, 7, 35, 1, 37, -1, 3, -13, 39, 1, 41, -1, 43, 1, -3, 5, 9, -15, 45, -1, 47, 1, -7, 49, -1, 3, -17, 51, 1, 53, -1, -5, 11, 55, 1, -3, -19, 57, -1, 59, 1, 61]

cp's OEIS Frontend

A274660 Irregular triangle read by rows in which row n lists the divisors d of 2*n+1 (A274658), given the sign (-1)^(n + (d-1)/2).

Table of values

List of values

n	a(n)
0	1
1	-1
2	3
3	1
4	5
5	-1
6	7
7	1
8	-3
9	9
10	-1
11	11
12	1
13	13
14	-1
15	3
16	-5
17	15
18	1
19	17
20	-1
21	19
22	1
23	-3
24	-7
25	21
26	-1
27	23
28	1
29	5
30	25
31	-1
32	3
33	-9
34	27
35	1
36	29
37	-1
38	31
39	1
40	-3
41	-11
42	33
43	-1
44	-5
45	7
46	35
47	1
48	37
49	-1
50	3
51	-13
52	39
53	1
54	41
55	-1
56	43
57	1
58	-3
59	5
60	9
61	-15
62	45
63	-1
64	47
65	1
66	-7
67	49
68	-1
69	3
70	-17
71	51
72	1
73	53
74	-1
75	-5
76	11
77	55
78	1
79	-3
80	-19
81	57
82	-1
83	59
84	1
85	61

n	a(n)
0	1
1	-1
2	3
3	1
4	5
5	-1
6	7
7	1
8	-3
9	9
10	-1
11	11
12	1
13	13
14	-1
15	3
16	-5
17	15
18	1
19	17
20	-1
21	19
22	1
23	-3
24	-7
25	21
26	-1
27	23
28	1
29	5
30	25
31	-1
32	3
33	-9
34	27
35	1
36	29
37	-1
38	31
39	1
40	-3
41	-11
42	33
43	-1
44	-5
45	7
46	35
47	1
48	37
49	-1
50	3
51	-13
52	39
53	1
54	41
55	-1
56	43
57	1
58	-3
59	5
60	9
61	-15
62	45
63	-1
64	47
65	1
66	-7
67	49
68	-1
69	3
70	-17
71	51
72	1
73	53
74	-1
75	-5
76	11
77	55
78	1
79	-3
80	-19
81	57
82	-1
83	59
84	1
85	61

n	a(n)
0	1
1	-1
2	3
3	1
4	5
5	-1
6	7
7	1
8	-3
9	9
10	-1
11	11
12	1
13	13
14	-1
15	3
16	-5
17	15
18	1
19	17
20	-1
21	19
22	1
23	-3
24	-7
25	21
26	-1
27	23
28	1
29	5
30	25
31	-1
32	3
33	-9
34	27
35	1
36	29
37	-1
38	31
39	1
40	-3
41	-11
42	33
43	-1
44	-5
45	7
46	35
47	1
48	37
49	-1
50	3
51	-13
52	39
53	1
54	41
55	-1
56	43
57	1
58	-3
59	5
60	9
61	-15
62	45
63	-1
64	47
65	1
66	-7
67	49
68	-1
69	3
70	-17
71	51
72	1
73	53
74	-1
75	-5
76	11
77	55
78	1
79	-3
80	-19
81	57
82	-1
83	59
84	1
85	61