A278933 - cp's OEIS frontend

A278933 Number of 2 X 2 matrices with entries in {0,1,...,n} and permanent = trace with no entry repeated.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	4
7	4
8	8
9	8
10	12
11	12
12	20
13	20
14	24
15	28
16	32
17	32
18	40
19	40
20	48
21	52
22	56
23	56
24	68
25	68
26	72
27	76
28	84
29	84
30	96
31	96
32	104
33	108
34	112
35	116
36	128
37	128
38	132
39	136
40	148
41	148
42	160
43	160
44	168
45	176
46	180
47	180
48	196
49	196
50	204

[0, 0, 0, 0, 0, 0, 4, 4, 8, 8, 12, 12, 20, 20, 24, 28, 32, 32, 40, 40, 48, 52, 56, 56, 68, 68, 72, 76, 84, 84, 96, 96, 104, 108, 112, 116, 128, 128, 132, 136, 148, 148, 160, 160, 168, 176, 180, 180, 196, 196, 204]

cp's OEIS Frontend

A278933 Number of 2 X 2 matrices with entries in {0,1,...,n} and permanent = trace with no entry repeated.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	4
7	4
8	8
9	8
10	12
11	12
12	20
13	20
14	24
15	28
16	32
17	32
18	40
19	40
20	48
21	52
22	56
23	56
24	68
25	68
26	72
27	76
28	84
29	84
30	96
31	96
32	104
33	108
34	112
35	116
36	128
37	128
38	132
39	136
40	148
41	148
42	160
43	160
44	168
45	176
46	180
47	180
48	196
49	196
50	204

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	4
7	4
8	8
9	8
10	12
11	12
12	20
13	20
14	24
15	28
16	32
17	32
18	40
19	40
20	48
21	52
22	56
23	56
24	68
25	68
26	72
27	76
28	84
29	84
30	96
31	96
32	104
33	108
34	112
35	116
36	128
37	128
38	132
39	136
40	148
41	148
42	160
43	160
44	168
45	176
46	180
47	180
48	196
49	196
50	204

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	4
7	4
8	8
9	8
10	12
11	12
12	20
13	20
14	24
15	28
16	32
17	32
18	40
19	40
20	48
21	52
22	56
23	56
24	68
25	68
26	72
27	76
28	84
29	84
30	96
31	96
32	104
33	108
34	112
35	116
36	128
37	128
38	132
39	136
40	148
41	148
42	160
43	160
44	168
45	176
46	180
47	180
48	196
49	196
50	204