A334044 - cp's OEIS frontend

A334044 a(1) = 0, and for any n > 1, a(n) is the number of points of the set { (k, a(k)), k = 1..n-2 } that are not visible from the point (n-1, a(n-1)).

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

[0, 0, 0, 1, 0, 2, 1, 0, 4, 1, 1, 2, 2, 2, 3, 2, 3, 5, 2, 6, 4, 3, 3, 4, 4, 7, 1, 5, 5, 2, 6, 5, 4, 6, 6, 9, 0, 6, 9, 3, 4, 7, 5, 8, 5, 6, 6, 10, 8, 10, 7, 7, 7, 5, 6, 11, 6, 11, 8, 6, 14, 8, 8, 10, 11, 9, 8, 15, 8, 12, 8, 12, 11, 6, 14, 8, 12, 14, 10, 13, 8]

cp's OEIS Frontend

A334044 a(1) = 0, and for any n > 1, a(n) is the number of points of the set { (k, a(k)), k = 1..n-2 } that are not visible from the point (n-1, a(n-1)).

Table of values

List of values

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

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

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