A049615 - cp's OEIS frontend

A049615 Array T by antidiagonals; T(i,j) = number of lattice points (x,y) hidden from (i,j), where 0<=x<=i, 0<=y<=j; (x,y) is hidden if there is a lattice point (h,k) collinear with and between (x,y) and (i,j).

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

[0, 0, 0, 1, 0, 1, 2, 1, 1, 2, 3, 2, 3, 2, 3, 4, 3, 4, 4, 3, 4, 5, 4, 6, 6, 6, 4, 5, 6, 5, 7, 8, 8, 7, 5, 6, 7, 6, 9, 9, 11, 9, 9, 6, 7, 8, 7, 10, 12, 12, 12, 12, 10, 7, 8, 9, 8, 12, 13, 16, 14, 16, 13, 12, 8, 9, 10, 9, 13, 15, 17, 18, 18, 17, 15, 13, 9, 10]

cp's OEIS Frontend

A049615 Array T by antidiagonals; T(i,j) = number of lattice points (x,y) hidden from (i,j), where 0<=x<=i, 0<=y<=j; (x,y) is hidden if there is a lattice point (h,k) collinear with and between (x,y) and (i,j).

Table of values

List of values

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

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

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