A333320 - cp's OEIS frontend

A333320 a(n) is the number of subsets of {1..n} that contain exactly 4 odd and 1 even numbers.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	0
6	0
7	3
8	4
9	20
10	25
11	75
12	90
13	210
14	245
15	490
16	560
17	1008
18	1134
19	1890
20	2100
21	3300
22	3630
23	5445
24	5940
25	8580
26	9295
27	13013
28	14014
29	19110
30	20475
31	27300
32	29120
33	38080
34	40460
35	52020
36	55080
37	69768
38	73644
39	92055
40	96900
41	119700
42	125685
43	153615
44	160930
45	194810
46	203665

[0, 0, 0, 0, 0, 0, 0, 3, 4, 20, 25, 75, 90, 210, 245, 490, 560, 1008, 1134, 1890, 2100, 3300, 3630, 5445, 5940, 8580, 9295, 13013, 14014, 19110, 20475, 27300, 29120, 38080, 40460, 52020, 55080, 69768, 73644, 92055, 96900, 119700, 125685, 153615, 160930, 194810, 203665]

cp's OEIS Frontend

A333320 a(n) is the number of subsets of {1..n} that contain exactly 4 odd and 1 even numbers.

Table of values

List of values