A063724 - cp's OEIS frontend

A063724 Consider problem of placing N queens on an n X n board so that each queen attacks precisely 4 others. Sequence gives maximal number of queens.

n	a(n)
1	0
2	0
3	0
4	8
5	11
6	15
7	18
8	21
9	24
10	27
11	30
12	33
13	36
14	39
15	42
16	45
17	48
18	51
19	54
20	57
21	60
22	63
23	66
24	69
25	72
26	75
27	78
28	81
29	84
30	87
31	90
32	93
33	96
34	99
35	102
36	105
37	108
38	111
39	114
40	117
41	120
42	123
43	126
44	129
45	132
46	135
47	138
48	141
49	144
50	147
51	150
52	153
53	156
54	159
55	162
56	165
57	168
58	171
59	174
60	177
61	180

[0, 0, 0, 8, 11, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99, 102, 105, 108, 111, 114, 117, 120, 123, 126, 129, 132, 135, 138, 141, 144, 147, 150, 153, 156, 159, 162, 165, 168, 171, 174, 177, 180]

cp's OEIS Frontend

A063724 Consider problem of placing N queens on an n X n board so that each queen attacks precisely 4 others. Sequence gives maximal number of queens.

Table of values

List of values

n	a(n)
1	0
2	0
3	0
4	8
5	11
6	15
7	18
8	21
9	24
10	27
11	30
12	33
13	36
14	39
15	42
16	45
17	48
18	51
19	54
20	57
21	60
22	63
23	66
24	69
25	72
26	75
27	78
28	81
29	84
30	87
31	90
32	93
33	96
34	99
35	102
36	105
37	108
38	111
39	114
40	117
41	120
42	123
43	126
44	129
45	132
46	135
47	138
48	141
49	144
50	147
51	150
52	153
53	156
54	159
55	162
56	165
57	168
58	171
59	174
60	177
61	180

n	a(n)
1	0
2	0
3	0
4	8
5	11
6	15
7	18
8	21
9	24
10	27
11	30
12	33
13	36
14	39
15	42
16	45
17	48
18	51
19	54
20	57
21	60
22	63
23	66
24	69
25	72
26	75
27	78
28	81
29	84
30	87
31	90
32	93
33	96
34	99
35	102
36	105
37	108
38	111
39	114
40	117
41	120
42	123
43	126
44	129
45	132
46	135
47	138
48	141
49	144
50	147
51	150
52	153
53	156
54	159
55	162
56	165
57	168
58	171
59	174
60	177
61	180

n	a(n)
1	0
2	0
3	0
4	8
5	11
6	15
7	18
8	21
9	24
10	27
11	30
12	33
13	36
14	39
15	42
16	45
17	48
18	51
19	54
20	57
21	60
22	63
23	66
24	69
25	72
26	75
27	78
28	81
29	84
30	87
31	90
32	93
33	96
34	99
35	102
36	105
37	108
38	111
39	114
40	117
41	120
42	123
43	126
44	129
45	132
46	135
47	138
48	141
49	144
50	147
51	150
52	153
53	156
54	159
55	162
56	165
57	168
58	171
59	174
60	177
61	180