A265694 - cp's OEIS frontend

A265694 a(n) = n!! mod n^2 where n!! is a double factorial number (A006882).

n	a(n)
1	0
2	2
3	3
4	8
5	15
6	12
7	7
8	0
9	54
10	40
11	110
12	0
13	104
14	84
15	0
16	0
17	221
18	0
19	342
20	0
21	0
22	220
23	506
24	0
25	0
26	312
27	0
28	0
29	493
30	0
31	930
32	0
33	0
34	544
35	0
36	0
37	222
38	684
39	0
40	0
41	369
42	0
43	1806
44	0
45	0
46	1012
47	47
48	0
49	0
50	0
51	0
52	0
53	1590
54	0
55	0
56	0
57	0
58	1624
59	59
60	0
61	3050
62	1860
63	0
64	0
65	0
66	0
67	4422
68	0
69	0
70	0

[0, 2, 3, 8, 15, 12, 7, 0, 54, 40, 110, 0, 104, 84, 0, 0, 221, 0, 342, 0, 0, 220, 506, 0, 0, 312, 0, 0, 493, 0, 930, 0, 0, 544, 0, 0, 222, 684, 0, 0, 369, 0, 1806, 0, 0, 1012, 47, 0, 0, 0, 0, 0, 1590, 0, 0, 0, 0, 1624, 59, 0, 3050, 1860, 0, 0, 0, 0, 4422, 0, 0, 0]

cp's OEIS Frontend

A265694 a(n) = n!! mod n^2 where n!! is a double factorial number (A006882).

Table of values

List of values