A280186 - cp's OEIS frontend

A280186 Number of 3-element subsets of S = {1..n} whose sum is odd.

n	a(n)
0	0
1	0
2	0
3	0
4	2
5	4
6	10
7	16
8	28
9	40
10	60
11	80
12	110
13	140
14	182
15	224
16	280
17	336
18	408
19	480
20	570
21	660
22	770
23	880
24	1012
25	1144
26	1300
27	1456
28	1638
29	1820
30	2030
31	2240
32	2480
33	2720
34	2992
35	3264
36	3570
37	3876
38	4218
39	4560
40	4940
41	5320
42	5740
43	6160
44	6622
45	7084
46	7590
47	8096
48	8648
49	9200

[0, 0, 0, 0, 2, 4, 10, 16, 28, 40, 60, 80, 110, 140, 182, 224, 280, 336, 408, 480, 570, 660, 770, 880, 1012, 1144, 1300, 1456, 1638, 1820, 2030, 2240, 2480, 2720, 2992, 3264, 3570, 3876, 4218, 4560, 4940, 5320, 5740, 6160, 6622, 7084, 7590, 8096, 8648, 9200]

cp's OEIS Frontend

A280186 Number of 3-element subsets of S = {1..n} whose sum is odd.

Table of values

List of values