A308178 - cp's OEIS frontend

A308178 Scan an infinite 45-degree triangular chessboard (cells (x,y) with 0 <= y <= x) by upwards antidiagonals, filling in each cell with the smallest nonnegative number already placed that cannot be seen by a chess queen at (x,y); sequence gives numbers along the successive antidiagonals.

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

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

cp's OEIS Frontend

A308178 Scan an infinite 45-degree triangular chessboard (cells (x,y) with 0 <= y <= x) by upwards antidiagonals, filling in each cell with the smallest nonnegative number already placed that cannot be seen by a chess queen at (x,y); sequence gives numbers along the successive antidiagonals.

Table of values

List of values

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

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

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