A032801 - cp's OEIS frontend

A032801 Number of unordered sets a, b, c, d of distinct integers from 1..n such that a+b+c+d = 0 (mod n).

n	a(n)
1	0
2	0
3	0
4	0
5	1
6	3
7	5
8	9
9	14
10	22
11	30
12	42
13	55
14	73
15	91
16	115
17	140
18	172
19	204
20	244
21	285
22	335
23	385
24	445
25	506
26	578
27	650
28	734
29	819
30	917
31	1015
32	1127
33	1240
34	1368
35	1496
36	1640
37	1785
38	1947
39	2109
40	2289
41	2470
42	2670
43	2870
44	3090
45	3311
46	3553
47	3795
48	4059
49	4324
50	4612
51	4900
52	5212
53	5525

[0, 0, 0, 0, 1, 3, 5, 9, 14, 22, 30, 42, 55, 73, 91, 115, 140, 172, 204, 244, 285, 335, 385, 445, 506, 578, 650, 734, 819, 917, 1015, 1127, 1240, 1368, 1496, 1640, 1785, 1947, 2109, 2289, 2470, 2670, 2870, 3090, 3311, 3553, 3795, 4059, 4324, 4612, 4900, 5212, 5525]

cp's OEIS Frontend

A032801 Number of unordered sets a, b, c, d of distinct integers from 1..n such that a+b+c+d = 0 (mod n).

Table of values

List of values