A333321 - cp's OEIS frontend

A333321 a(n) is the number of subsets of {1..n} that contain exactly 1 odd and 4 even numbers.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	4
9	5
10	25
11	30
12	90
13	105
14	245
15	280
16	560
17	630
18	1134
19	1260
20	2100
21	2310
22	3630
23	3960
24	5940
25	6435
26	9295
27	10010
28	14014
29	15015
30	20475
31	21840
32	29120
33	30940
34	40460
35	42840
36	55080
37	58140
38	73644
39	77520
40	96900
41	101745
42	125685
43	131670
44	160930
45	168245
46	203665
47	212520

[0, 0, 0, 0, 0, 0, 0, 0, 4, 5, 25, 30, 90, 105, 245, 280, 560, 630, 1134, 1260, 2100, 2310, 3630, 3960, 5940, 6435, 9295, 10010, 14014, 15015, 20475, 21840, 29120, 30940, 40460, 42840, 55080, 58140, 73644, 77520, 96900, 101745, 125685, 131670, 160930, 168245, 203665, 212520]

cp's OEIS Frontend

A333321 a(n) is the number of subsets of {1..n} that contain exactly 1 odd and 4 even numbers.

Table of values

List of values