A308896 - cp's OEIS frontend

A308896 Walk a rook along the square spiral numbered 0, 1, 2, ... (cf. A274641); a(n) = mex of earlier values the rook can move to.

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

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

cp's OEIS Frontend

A308896 Walk a rook along the square spiral numbered 0, 1, 2, ... (cf. A274641); a(n) = mex of earlier values the rook can move to.

Table of values

List of values

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

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

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