A225552 - cp's OEIS frontend

A225552 Longest checkmate in king and rook versus king endgame on an n X n chessboard.

n	a(n)
3	3
4	7
5	10
6	12
7	14
8	16
9	18
10	21
11	23
12	25
13	28
14	30
15	33
16	35
17	38
18	39
19	42
20	44
21	47
22	49
23	52
24	54
25	56
26	58
27	61
28	63
29	66
30	67
31	70
32	72
33	75
34	77
35	80
36	81
37	84
38	86
39	89
40	91
41	94
42	95
43	98
44	100
45	103
46	105
47	108
48	109
49	112
50	114
51	117
52	119
53	122
54	123

[3, 7, 10, 12, 14, 16, 18, 21, 23, 25, 28, 30, 33, 35, 38, 39, 42, 44, 47, 49, 52, 54, 56, 58, 61, 63, 66, 67, 70, 72, 75, 77, 80, 81, 84, 86, 89, 91, 94, 95, 98, 100, 103, 105, 108, 109, 112, 114, 117, 119, 122, 123]

cp's OEIS Frontend

A225552 Longest checkmate in king and rook versus king endgame on an n X n chessboard.

Table of values

List of values

n	a(n)
3	3
4	7
5	10
6	12
7	14
8	16
9	18
10	21
11	23
12	25
13	28
14	30
15	33
16	35
17	38
18	39
19	42
20	44
21	47
22	49
23	52
24	54
25	56
26	58
27	61
28	63
29	66
30	67
31	70
32	72
33	75
34	77
35	80
36	81
37	84
38	86
39	89
40	91
41	94
42	95
43	98
44	100
45	103
46	105
47	108
48	109
49	112
50	114
51	117
52	119
53	122
54	123

n	a(n)
3	3
4	7
5	10
6	12
7	14
8	16
9	18
10	21
11	23
12	25
13	28
14	30
15	33
16	35
17	38
18	39
19	42
20	44
21	47
22	49
23	52
24	54
25	56
26	58
27	61
28	63
29	66
30	67
31	70
32	72
33	75
34	77
35	80
36	81
37	84
38	86
39	89
40	91
41	94
42	95
43	98
44	100
45	103
46	105
47	108
48	109
49	112
50	114
51	117
52	119
53	122
54	123

n	a(n)
3	3
4	7
5	10
6	12
7	14
8	16
9	18
10	21
11	23
12	25
13	28
14	30
15	33
16	35
17	38
18	39
19	42
20	44
21	47
22	49
23	52
24	54
25	56
26	58
27	61
28	63
29	66
30	67
31	70
32	72
33	75
34	77
35	80
36	81
37	84
38	86
39	89
40	91
41	94
42	95
43	98
44	100
45	103
46	105
47	108
48	109
49	112
50	114
51	117
52	119
53	122
54	123