A368945 - cp's OEIS frontend

A368945 a(n) is the length of the central extent of width 0 for the symmetric representation of sigma, SRS(n), when that has an even number of parts otherwise -1.

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

[-1, -1, 0, -1, 2, -1, 4, -1, -1, 0, 8, -1, 10, 2, -1, -1, 14, -1, 16, -1, 0, 6, 20, -1, -1, 8, 2, -1, 26, -1, 28, -1, 4, 12, -1, -1, 34, 14, 6, -1, 38, -1, 40, 2, -1, 18, 44, -1, -1, -1, 10, 4, 50, -1, 0, -1, 12, 24, 56, -1, 58, 26, -1, -1, 2, -1, 64, 8, 16, -1, 68, -1, 70, 32, 4, 10, -1, 0, 76, -1]

cp's OEIS Frontend

A368945 a(n) is the length of the central extent of width 0 for the symmetric representation of sigma, SRS(n), when that has an even number of parts otherwise -1.

Table of values

List of values

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

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

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