A003816 - cp's OEIS frontend

A003816 a(0) = 0, a(n) = a(n-1) XOR -n.

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

[0, 1, -1, 4, 0, 5, -1, 8, 0, 9, -1, 12, 0, 13, -1, 16, 0, 17, -1, 20, 0, 21, -1, 24, 0, 25, -1, 28, 0, 29, -1, 32, 0, 33, -1, 36, 0, 37, -1, 40, 0, 41, -1, 44, 0, 45, -1, 48, 0, 49, -1, 52, 0, 53, -1, 56, 0, 57, -1, 60, 0, 61, -1, 64, 0, 65, -1, 68]

cp's OEIS Frontend

A003816 a(0) = 0, a(n) = a(n-1) XOR -n.

Table of values

List of values

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

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

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