A047193 - cp's OEIS frontend

A047193 Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= n/3.

n	a(n)
1	0
2	0
3	2
4	3
5	4
6	14
7	20
8	27
9	83
10	119
11	164
12	494
13	714
14	1000
15	3002
16	4367
17	6187
18	18563
19	27131
20	38759
21	116279
22	170543
23	245156
24	735470
25	1081574
26	1562274
27	4686824
28	6906899
29	10015004
30	30045014
31	44352164
32	64512239
33	193536719
34	286097759

[0, 0, 2, 3, 4, 14, 20, 27, 83, 119, 164, 494, 714, 1000, 3002, 4367, 6187, 18563, 27131, 38759, 116279, 170543, 245156, 735470, 1081574, 1562274, 4686824, 6906899, 10015004, 30045014, 44352164, 64512239, 193536719, 286097759]

cp's OEIS Frontend

A047193 Number of nonempty subsets of {1,2,...,n} in which exactly 1/2 of the elements are <= n/3.

Table of values

List of values