A290691 - cp's OEIS frontend

A290691 Triangle read by rows: infinite braid made of periodically-colored yarns in which the crossing of two adjacent yarns occurs when two color 0's are side by side (see comments).

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

[1, 0, 2, 1, 1, 3, 0, 0, 2, 4, 2, 1, 1, 3, 5, 1, 0, 0, 2, 4, 6, 0, 3, 1, 1, 3, 5, 7, 2, 2, 0, 0, 2, 4, 6, 8, 1, 1, 4, 1, 1, 3, 5, 7, 9, 0, 0, 3, 0, 0, 2, 4, 6, 8, 10, 3, 2, 2, 5, 1, 1, 3, 5, 7, 9, 11, 2, 1, 1, 4, 0, 0, 2, 4, 6, 8, 10, 12, 1, 0, 0, 3, 6, 1, 1]

cp's OEIS Frontend

A290691 Triangle read by rows: infinite braid made of periodically-colored yarns in which the crossing of two adjacent yarns occurs when two color 0's are side by side (see comments).

Table of values

List of values

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

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

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