A051756 - cp's OEIS frontend

A051756 Consider the problem of placing N queens on an n X n board so that each queen attacks precisely 3 others. Sequence gives maximal number of queens.

n	a(n)
2	4
3	6
4	8
5	10
6	12
7	16
8	18
9	20
10	22
11	24
12	28
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	52
23	54
24	56
25	58
26	60
27	64
28	66
29	68
30	70
31	72
32	76
33	78
34	80
35	82
36	84
37	88
38	90
39	92
40	94
41	96
42	100
43	102
44	104
45	106
46	108
47	112
48	114
49	116
50	118
51	120
52	124
53	126
54	128
55	130
56	132
57	136
58	138
59	140
60	142
61	144

[4, 6, 8, 10, 12, 16, 18, 20, 22, 24, 28, 30, 32, 34, 36, 40, 42, 44, 46, 48, 52, 54, 56, 58, 60, 64, 66, 68, 70, 72, 76, 78, 80, 82, 84, 88, 90, 92, 94, 96, 100, 102, 104, 106, 108, 112, 114, 116, 118, 120, 124, 126, 128, 130, 132, 136, 138, 140, 142, 144]

cp's OEIS Frontend

A051756 Consider the problem of placing N queens on an n X n board so that each queen attacks precisely 3 others. Sequence gives maximal number of queens.

Table of values

List of values

n	a(n)
2	4
3	6
4	8
5	10
6	12
7	16
8	18
9	20
10	22
11	24
12	28
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	52
23	54
24	56
25	58
26	60
27	64
28	66
29	68
30	70
31	72
32	76
33	78
34	80
35	82
36	84
37	88
38	90
39	92
40	94
41	96
42	100
43	102
44	104
45	106
46	108
47	112
48	114
49	116
50	118
51	120
52	124
53	126
54	128
55	130
56	132
57	136
58	138
59	140
60	142
61	144

n	a(n)
2	4
3	6
4	8
5	10
6	12
7	16
8	18
9	20
10	22
11	24
12	28
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	52
23	54
24	56
25	58
26	60
27	64
28	66
29	68
30	70
31	72
32	76
33	78
34	80
35	82
36	84
37	88
38	90
39	92
40	94
41	96
42	100
43	102
44	104
45	106
46	108
47	112
48	114
49	116
50	118
51	120
52	124
53	126
54	128
55	130
56	132
57	136
58	138
59	140
60	142
61	144

n	a(n)
2	4
3	6
4	8
5	10
6	12
7	16
8	18
9	20
10	22
11	24
12	28
13	30
14	32
15	34
16	36
17	40
18	42
19	44
20	46
21	48
22	52
23	54
24	56
25	58
26	60
27	64
28	66
29	68
30	70
31	72
32	76
33	78
34	80
35	82
36	84
37	88
38	90
39	92
40	94
41	96
42	100
43	102
44	104
45	106
46	108
47	112
48	114
49	116
50	118
51	120
52	124
53	126
54	128
55	130
56	132
57	136
58	138
59	140
60	142
61	144