A047167 - cp's OEIS frontend

A047167 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= n/2.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	3
7	6
8	24
9	40
10	100
11	150
12	315
13	455
14	980
15	1470
16	3528
17	5544
18	13692
19	21630
20	51600
21	80520
22	186945
23	290400
24	675675
25	1056627
26	2492919
27	3929926
28	9324406
29	14742910
30	34860553
31	55107598
32	129804808
33	205272008
34	483483128
35	765991032
36	1807560972
37	2869786524
38	6779169543

[0, 0, 0, 0, 0, 3, 6, 24, 40, 100, 150, 315, 455, 980, 1470, 3528, 5544, 13692, 21630, 51600, 80520, 186945, 290400, 675675, 1056627, 2492919, 3929926, 9324406, 14742910, 34860553, 55107598, 129804808, 205272008, 483483128, 765991032, 1807560972, 2869786524, 6779169543]

cp's OEIS Frontend

A047167 Number of nonempty subsets of {1,2,...,n} in which exactly 3/5 of the elements are <= n/2.

Table of values

List of values