A121206 - cp's OEIS frontend

A121206 a(n) = (2n)! mod n(2n+1).

n	a(n)
1	2
2	4
3	6
4	0
5	10
6	12
7	0
8	16
9	18
10	0
11	22
12	0
13	0
14	28
15	30
16	0
17	0
18	36
19	0
20	40
21	42
22	0
23	46
24	0
25	0
26	52
27	0
28	0
29	58
30	60
31	0
32	0
33	66
34	0
35	70
36	72
37	0
38	0
39	78
40	0
41	82
42	0
43	0
44	88
45	0
46	0
47	0
48	96
49	0
50	100
51	102
52	0
53	106
54	108
55	0
56	112
57	0
58	0
59	0
60	0
61	0
62	0
63	126
64	0
65	130
66	0
67	0
68	136
69	138
70	0
71	0
72	0
73	0
74	148
75	150
76	0
77	0
78	156
79	0
80	0
81	162

[2, 4, 6, 0, 10, 12, 0, 16, 18, 0, 22, 0, 0, 28, 30, 0, 0, 36, 0, 40, 42, 0, 46, 0, 0, 52, 0, 0, 58, 60, 0, 0, 66, 0, 70, 72, 0, 0, 78, 0, 82, 0, 0, 88, 0, 0, 0, 96, 0, 100, 102, 0, 106, 108, 0, 112, 0, 0, 0, 0, 0, 0, 126, 0, 130, 0, 0, 136, 138, 0, 0, 0, 0, 148, 150, 0, 0, 156, 0, 0, 162]

cp's OEIS Frontend

A121206 a(n) = (2n)! mod n(2n+1).

Table of values

List of values

n	a(n)
1	2
2	4
3	6
4	0
5	10
6	12
7	0
8	16
9	18
10	0
11	22
12	0
13	0
14	28
15	30
16	0
17	0
18	36
19	0
20	40
21	42
22	0
23	46
24	0
25	0
26	52
27	0
28	0
29	58
30	60
31	0
32	0
33	66
34	0
35	70
36	72
37	0
38	0
39	78
40	0
41	82
42	0
43	0
44	88
45	0
46	0
47	0
48	96
49	0
50	100
51	102
52	0
53	106
54	108
55	0
56	112
57	0
58	0
59	0
60	0
61	0
62	0
63	126
64	0
65	130
66	0
67	0
68	136
69	138
70	0
71	0
72	0
73	0
74	148
75	150
76	0
77	0
78	156
79	0
80	0
81	162

n	a(n)
1	2
2	4
3	6
4	0
5	10
6	12
7	0
8	16
9	18
10	0
11	22
12	0
13	0
14	28
15	30
16	0
17	0
18	36
19	0
20	40
21	42
22	0
23	46
24	0
25	0
26	52
27	0
28	0
29	58
30	60
31	0
32	0
33	66
34	0
35	70
36	72
37	0
38	0
39	78
40	0
41	82
42	0
43	0
44	88
45	0
46	0
47	0
48	96
49	0
50	100
51	102
52	0
53	106
54	108
55	0
56	112
57	0
58	0
59	0
60	0
61	0
62	0
63	126
64	0
65	130
66	0
67	0
68	136
69	138
70	0
71	0
72	0
73	0
74	148
75	150
76	0
77	0
78	156
79	0
80	0
81	162

n	a(n)
1	2
2	4
3	6
4	0
5	10
6	12
7	0
8	16
9	18
10	0
11	22
12	0
13	0
14	28
15	30
16	0
17	0
18	36
19	0
20	40
21	42
22	0
23	46
24	0
25	0
26	52
27	0
28	0
29	58
30	60
31	0
32	0
33	66
34	0
35	70
36	72
37	0
38	0
39	78
40	0
41	82
42	0
43	0
44	88
45	0
46	0
47	0
48	96
49	0
50	100
51	102
52	0
53	106
54	108
55	0
56	112
57	0
58	0
59	0
60	0
61	0
62	0
63	126
64	0
65	130
66	0
67	0
68	136
69	138
70	0
71	0
72	0
73	0
74	148
75	150
76	0
77	0
78	156
79	0
80	0
81	162