A308890 - cp's OEIS frontend

A308890 Follow along the squares in the square spiral (as in A274640); in each square write the smallest positive number that a knight placed at that square cannot see.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	2
8	3
9	3
10	2
11	2
12	2
13	2
14	3
15	3
16	2
17	3
18	4
19	4
20	3
21	1
22	2
23	4
24	3
25	2
26	1
27	4
28	4
29	4
30	3
31	1
32	2
33	4
34	4
35	2
36	1
37	1
38	1
39	4
40	4
41	1
42	1
43	1
44	3
45	2
46	4
47	4
48	1
49	1
50	1
51	3
52	3
53	4
54	3
55	1
56	1
57	1
58	3
59	2
60	4
61	4
62	2
63	3
64	1
65	2
66	1
67	2
68	2
69	2
70	2
71	1
72	2
73	2
74	3
75	3
76	2
77	4
78	3
79	2
80	1
81	2
82	2
83	2
84	3
85	2
86	2
87	2
88	2
89	1
90	2
91	2
92	3
93	3
94	2
95	1

[1, 1, 1, 1, 2, 2, 2, 3, 3, 2, 2, 2, 2, 3, 3, 2, 3, 4, 4, 3, 1, 2, 4, 3, 2, 1, 4, 4, 4, 3, 1, 2, 4, 4, 2, 1, 1, 1, 4, 4, 1, 1, 1, 3, 2, 4, 4, 1, 1, 1, 3, 3, 4, 3, 1, 1, 1, 3, 2, 4, 4, 2, 3, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 3, 3, 2, 4, 3, 2, 1, 2, 2, 2, 3, 2, 2, 2, 2, 1, 2, 2, 3, 3, 2, 1]

cp's OEIS Frontend

A308890 Follow along the squares in the square spiral (as in A274640); in each square write the smallest positive number that a knight placed at that square cannot see.

Table of values

List of values

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	2
8	3
9	3
10	2
11	2
12	2
13	2
14	3
15	3
16	2
17	3
18	4
19	4
20	3
21	1
22	2
23	4
24	3
25	2
26	1
27	4
28	4
29	4
30	3
31	1
32	2
33	4
34	4
35	2
36	1
37	1
38	1
39	4
40	4
41	1
42	1
43	1
44	3
45	2
46	4
47	4
48	1
49	1
50	1
51	3
52	3
53	4
54	3
55	1
56	1
57	1
58	3
59	2
60	4
61	4
62	2
63	3
64	1
65	2
66	1
67	2
68	2
69	2
70	2
71	1
72	2
73	2
74	3
75	3
76	2
77	4
78	3
79	2
80	1
81	2
82	2
83	2
84	3
85	2
86	2
87	2
88	2
89	1
90	2
91	2
92	3
93	3
94	2
95	1

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	2
8	3
9	3
10	2
11	2
12	2
13	2
14	3
15	3
16	2
17	3
18	4
19	4
20	3
21	1
22	2
23	4
24	3
25	2
26	1
27	4
28	4
29	4
30	3
31	1
32	2
33	4
34	4
35	2
36	1
37	1
38	1
39	4
40	4
41	1
42	1
43	1
44	3
45	2
46	4
47	4
48	1
49	1
50	1
51	3
52	3
53	4
54	3
55	1
56	1
57	1
58	3
59	2
60	4
61	4
62	2
63	3
64	1
65	2
66	1
67	2
68	2
69	2
70	2
71	1
72	2
73	2
74	3
75	3
76	2
77	4
78	3
79	2
80	1
81	2
82	2
83	2
84	3
85	2
86	2
87	2
88	2
89	1
90	2
91	2
92	3
93	3
94	2
95	1

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	2
7	2
8	3
9	3
10	2
11	2
12	2
13	2
14	3
15	3
16	2
17	3
18	4
19	4
20	3
21	1
22	2
23	4
24	3
25	2
26	1
27	4
28	4
29	4
30	3
31	1
32	2
33	4
34	4
35	2
36	1
37	1
38	1
39	4
40	4
41	1
42	1
43	1
44	3
45	2
46	4
47	4
48	1
49	1
50	1
51	3
52	3
53	4
54	3
55	1
56	1
57	1
58	3
59	2
60	4
61	4
62	2
63	3
64	1
65	2
66	1
67	2
68	2
69	2
70	2
71	1
72	2
73	2
74	3
75	3
76	2
77	4
78	3
79	2
80	1
81	2
82	2
83	2
84	3
85	2
86	2
87	2
88	2
89	1
90	2
91	2
92	3
93	3
94	2
95	1