A232007 - cp's OEIS frontend

A232007 Maximal number of moves needed by a knight to reach every square from a fixed position on an n X n chessboard, or -1 if it is not possible to reach every square.

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

[0, -1, -1, 5, 4, 4, 5, 6, 6, 7, 8, 8, 9, 10, 10, 11, 12, 12, 13, 14, 14, 15, 16, 16, 17, 18, 18, 19, 20, 20, 21, 22, 22, 23, 24, 24, 25, 26, 26, 27, 28, 28, 29, 30, 30, 31, 32, 32, 33, 34, 34, 35, 36, 36, 37, 38, 38, 39, 40, 40, 41, 42, 42, 43, 44, 44, 45, 46, 46]

cp's OEIS Frontend

A232007 Maximal number of moves needed by a knight to reach every square from a fixed position on an n X n chessboard, or -1 if it is not possible to reach every square.

Table of values

List of values

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

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

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