A131505 - cp's OEIS frontend

A131505 n, -1, n, 2n+2.

n	a(n)
0	0
1	-1
2	0
3	2
4	1
5	-1
6	1
7	4
8	2
9	-1
10	2
11	6
12	3
13	-1
14	3
15	8
16	4
17	-1
18	4
19	10
20	5
21	-1
22	5
23	12
24	6
25	-1
26	6
27	14
28	7
29	-1
30	7
31	16
32	8
33	-1
34	8
35	18
36	9
37	-1
38	9
39	20
40	10
41	-1
42	10
43	22
44	11
45	-1
46	11
47	24
48	12
49	-1
50	12
51	26
52	13
53	-1
54	13
55	28
56	14
57	-1
58	14
59	30
60	15
61	-1
62	15
63	32
64	16
65	-1
66	16
67	34
68	17
69	-1
70	17
71	36
72	18
73	-1
74	18
75	38
76	19
77	-1
78	19
79	40
80	20
81	-1
82	20
83	42
84	21
85	-1
86	21
87	44
88	22
89	-1
90	22
91	46
92	23

[0, -1, 0, 2, 1, -1, 1, 4, 2, -1, 2, 6, 3, -1, 3, 8, 4, -1, 4, 10, 5, -1, 5, 12, 6, -1, 6, 14, 7, -1, 7, 16, 8, -1, 8, 18, 9, -1, 9, 20, 10, -1, 10, 22, 11, -1, 11, 24, 12, -1, 12, 26, 13, -1, 13, 28, 14, -1, 14, 30, 15, -1, 15, 32, 16, -1, 16, 34, 17, -1, 17, 36, 18, -1, 18, 38, 19, -1, 19, 40, 20, -1, 20, 42, 21, -1, 21, 44, 22, -1, 22, 46, 23]

cp's OEIS Frontend

A131505 n, -1, n, 2n+2.

Table of values

List of values

n	a(n)
0	0
1	-1
2	0
3	2
4	1
5	-1
6	1
7	4
8	2
9	-1
10	2
11	6
12	3
13	-1
14	3
15	8
16	4
17	-1
18	4
19	10
20	5
21	-1
22	5
23	12
24	6
25	-1
26	6
27	14
28	7
29	-1
30	7
31	16
32	8
33	-1
34	8
35	18
36	9
37	-1
38	9
39	20
40	10
41	-1
42	10
43	22
44	11
45	-1
46	11
47	24
48	12
49	-1
50	12
51	26
52	13
53	-1
54	13
55	28
56	14
57	-1
58	14
59	30
60	15
61	-1
62	15
63	32
64	16
65	-1
66	16
67	34
68	17
69	-1
70	17
71	36
72	18
73	-1
74	18
75	38
76	19
77	-1
78	19
79	40
80	20
81	-1
82	20
83	42
84	21
85	-1
86	21
87	44
88	22
89	-1
90	22
91	46
92	23

n	a(n)
0	0
1	-1
2	0
3	2
4	1
5	-1
6	1
7	4
8	2
9	-1
10	2
11	6
12	3
13	-1
14	3
15	8
16	4
17	-1
18	4
19	10
20	5
21	-1
22	5
23	12
24	6
25	-1
26	6
27	14
28	7
29	-1
30	7
31	16
32	8
33	-1
34	8
35	18
36	9
37	-1
38	9
39	20
40	10
41	-1
42	10
43	22
44	11
45	-1
46	11
47	24
48	12
49	-1
50	12
51	26
52	13
53	-1
54	13
55	28
56	14
57	-1
58	14
59	30
60	15
61	-1
62	15
63	32
64	16
65	-1
66	16
67	34
68	17
69	-1
70	17
71	36
72	18
73	-1
74	18
75	38
76	19
77	-1
78	19
79	40
80	20
81	-1
82	20
83	42
84	21
85	-1
86	21
87	44
88	22
89	-1
90	22
91	46
92	23

n	a(n)
0	0
1	-1
2	0
3	2
4	1
5	-1
6	1
7	4
8	2
9	-1
10	2
11	6
12	3
13	-1
14	3
15	8
16	4
17	-1
18	4
19	10
20	5
21	-1
22	5
23	12
24	6
25	-1
26	6
27	14
28	7
29	-1
30	7
31	16
32	8
33	-1
34	8
35	18
36	9
37	-1
38	9
39	20
40	10
41	-1
42	10
43	22
44	11
45	-1
46	11
47	24
48	12
49	-1
50	12
51	26
52	13
53	-1
54	13
55	28
56	14
57	-1
58	14
59	30
60	15
61	-1
62	15
63	32
64	16
65	-1
66	16
67	34
68	17
69	-1
70	17
71	36
72	18
73	-1
74	18
75	38
76	19
77	-1
78	19
79	40
80	20
81	-1
82	20
83	42
84	21
85	-1
86	21
87	44
88	22
89	-1
90	22
91	46
92	23