A131730 - cp's OEIS frontend

A131730 a(4n) = n, a(4n+1) = -n-1, a(4n+2) = n+1, a(4n+3) = -n.

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

[0, -1, 1, 0, 1, -2, 2, -1, 2, -3, 3, -2, 3, -4, 4, -3, 4, -5, 5, -4, 5, -6, 6, -5, 6, -7, 7, -6, 7, -8, 8, -7, 8, -9, 9, -8, 9, -10, 10, -9, 10, -11, 11, -10, 11, -12, 12, -11, 12, -13, 13, -12, 13, -14, 14, -13, 14, -15, 15, -14, 15, -16, 16, -15, 16, -17, 17, -16, 17, -18, 18, -17, 18, -19, 19, -18, 19, -20, 20, -19, 20, -21, 21, -20]

cp's OEIS Frontend

A131730 a(4n) = n, a(4n+1) = -n-1, a(4n+2) = n+1, a(4n+3) = -n.

Table of values

List of values

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

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

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