A007912 - cp's OEIS frontend

A007912 Quantum factorials: (n-1)!! - (n-2)!! (mod n).

n	a(n)
3	1
4	1
5	0
6	1
7	5
8	1
9	0
10	1
11	2
12	3
13	0
14	1
15	0
16	1
17	0
18	9
19	2
20	15
21	0
22	1
23	2
24	9
25	0
26	1
27	0
28	7
29	0
30	15
31	2
32	1
33	0
34	1
35	0
36	27
37	0
38	1
39	0
40	25
41	0
42	21
43	2
44	11
45	0
46	1
47	45
48	33
49	0
50	25
51	0
52	39
53	0
54	27
55	0
56	49
57	0
58	1
59	57
60	15
61	0
62	1
63	0
64	1
65	0
66	33
67	2
68	51
69	0
70	35
71	2
72	9
73	0
74	1
75	0
76	19
77	0
78	39
79	77
80	65
81	0
82	1
83	81
84	63
85	0
86	1
87	0
88	33
89	0
90	45
91	0

[1, 1, 0, 1, 5, 1, 0, 1, 2, 3, 0, 1, 0, 1, 0, 9, 2, 15, 0, 1, 2, 9, 0, 1, 0, 7, 0, 15, 2, 1, 0, 1, 0, 27, 0, 1, 0, 25, 0, 21, 2, 11, 0, 1, 45, 33, 0, 25, 0, 39, 0, 27, 0, 49, 0, 1, 57, 15, 0, 1, 0, 1, 0, 33, 2, 51, 0, 35, 2, 9, 0, 1, 0, 19, 0, 39, 77, 65, 0, 1, 81, 63, 0, 1, 0, 33, 0, 45, 0]

cp's OEIS Frontend

A007912 Quantum factorials: (n-1)!! - (n-2)!! (mod n).

Table of values

List of values

n	a(n)
3	1
4	1
5	0
6	1
7	5
8	1
9	0
10	1
11	2
12	3
13	0
14	1
15	0
16	1
17	0
18	9
19	2
20	15
21	0
22	1
23	2
24	9
25	0
26	1
27	0
28	7
29	0
30	15
31	2
32	1
33	0
34	1
35	0
36	27
37	0
38	1
39	0
40	25
41	0
42	21
43	2
44	11
45	0
46	1
47	45
48	33
49	0
50	25
51	0
52	39
53	0
54	27
55	0
56	49
57	0
58	1
59	57
60	15
61	0
62	1
63	0
64	1
65	0
66	33
67	2
68	51
69	0
70	35
71	2
72	9
73	0
74	1
75	0
76	19
77	0
78	39
79	77
80	65
81	0
82	1
83	81
84	63
85	0
86	1
87	0
88	33
89	0
90	45
91	0

n	a(n)
3	1
4	1
5	0
6	1
7	5
8	1
9	0
10	1
11	2
12	3
13	0
14	1
15	0
16	1
17	0
18	9
19	2
20	15
21	0
22	1
23	2
24	9
25	0
26	1
27	0
28	7
29	0
30	15
31	2
32	1
33	0
34	1
35	0
36	27
37	0
38	1
39	0
40	25
41	0
42	21
43	2
44	11
45	0
46	1
47	45
48	33
49	0
50	25
51	0
52	39
53	0
54	27
55	0
56	49
57	0
58	1
59	57
60	15
61	0
62	1
63	0
64	1
65	0
66	33
67	2
68	51
69	0
70	35
71	2
72	9
73	0
74	1
75	0
76	19
77	0
78	39
79	77
80	65
81	0
82	1
83	81
84	63
85	0
86	1
87	0
88	33
89	0
90	45
91	0

n	a(n)
3	1
4	1
5	0
6	1
7	5
8	1
9	0
10	1
11	2
12	3
13	0
14	1
15	0
16	1
17	0
18	9
19	2
20	15
21	0
22	1
23	2
24	9
25	0
26	1
27	0
28	7
29	0
30	15
31	2
32	1
33	0
34	1
35	0
36	27
37	0
38	1
39	0
40	25
41	0
42	21
43	2
44	11
45	0
46	1
47	45
48	33
49	0
50	25
51	0
52	39
53	0
54	27
55	0
56	49
57	0
58	1
59	57
60	15
61	0
62	1
63	0
64	1
65	0
66	33
67	2
68	51
69	0
70	35
71	2
72	9
73	0
74	1
75	0
76	19
77	0
78	39
79	77
80	65
81	0
82	1
83	81
84	63
85	0
86	1
87	0
88	33
89	0
90	45
91	0