A175567 - cp's OEIS frontend

A175567 (n!)^2 modulo n(n+1)/2.

n	a(n)
1	0
2	1
3	0
4	6
5	0
6	15
7	0
8	0
9	0
10	45
11	0
12	66
13	0
14	0
15	0
16	120
17	0
18	153
19	0
20	0
21	0
22	231
23	0
24	0
25	0
26	0
27	0
28	378
29	0
30	435
31	0
32	0
33	0
34	0
35	0
36	630
37	0
38	0
39	0
40	780
41	0
42	861
43	0
44	0
45	0
46	1035
47	0
48	0
49	0
50	0
51	0
52	1326
53	0
54	0
55	0
56	0
57	0
58	1653
59	0
60	1770
61	0
62	0
63	0
64	0
65	0
66	2145
67	0
68	0
69	0
70	2415
71	0
72	2556
73	0
74	0
75	0
76	0
77	0
78	3003
79	0
80	0
81	0
82	3321

[0, 1, 0, 6, 0, 15, 0, 0, 0, 45, 0, 66, 0, 0, 0, 120, 0, 153, 0, 0, 0, 231, 0, 0, 0, 0, 0, 378, 0, 435, 0, 0, 0, 0, 0, 630, 0, 0, 0, 780, 0, 861, 0, 0, 0, 1035, 0, 0, 0, 0, 0, 1326, 0, 0, 0, 0, 0, 1653, 0, 1770, 0, 0, 0, 0, 0, 2145, 0, 0, 0, 2415, 0, 2556, 0, 0, 0, 0, 0, 3003, 0, 0, 0, 3321]

cp's OEIS Frontend

A175567 (n!)^2 modulo n(n+1)/2.

Table of values

List of values