A308897 - cp's OEIS frontend

A308897 Walk a rook along the square spiral numbered 1, 2, 3, ... (cf. A274640); a(n) = mex of earlier values the rook can move to.

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

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

cp's OEIS Frontend

A308897 Walk a rook along the square spiral numbered 1, 2, 3, ... (cf. A274640); a(n) = mex of earlier values the rook can move to.

Table of values

List of values

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

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

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