A047170 - cp's OEIS frontend

A047170 Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= n/2.

n	a(n)
1	0
2	0
3	0
4	0
5	0
6	0
7	0
8	0
9	0
10	5
11	6
12	36
13	42
14	147
15	168
16	448
17	504
18	1134
19	1260
20	2565
21	2827
22	5687
23	6270
24	13860
25	15444
26	39039
27	44044
28	119119
29	135135
30	360815
31	408968
32	1039808
33	1174224
34	2842604
35	3197904
36	7515054
37	8436114
38	19773414
39	22203020
40	53093125
41	59750649
42	146794494

[0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 6, 36, 42, 147, 168, 448, 504, 1134, 1260, 2565, 2827, 5687, 6270, 13860, 15444, 39039, 44044, 119119, 135135, 360815, 408968, 1039808, 1174224, 2842604, 3197904, 7515054, 8436114, 19773414, 22203020, 53093125, 59750649, 146794494]

cp's OEIS Frontend

A047170 Number of nonempty subsets of {1,2,...,n} in which exactly 5/6 of the elements are <= n/2.

Table of values

List of values