A357812 - cp's OEIS frontend

A357812 Number of subsets of [n] in which exactly half of the elements are powers of 2.

n	a(n)
0	1
1	1
2	1
3	3
4	4
5	10
6	20
7	35
8	70
9	126
10	210
11	330
12	495
13	715
14	1001
15	1365
16	4368
17	6188
18	8568
19	11628
20	15504
21	20349
22	26334
23	33649
24	42504
25	53130
26	65780
27	80730
28	98280
29	118755
30	142506
31	169911
32	906192
33	1107568
34	1344904
35	1623160
36	1947792
37	2324784
38	2760681
39	3262623
40	3838380

[1, 1, 1, 3, 4, 10, 20, 35, 70, 126, 210, 330, 495, 715, 1001, 1365, 4368, 6188, 8568, 11628, 15504, 20349, 26334, 33649, 42504, 53130, 65780, 80730, 98280, 118755, 142506, 169911, 906192, 1107568, 1344904, 1623160, 1947792, 2324784, 2760681, 3262623, 3838380]

cp's OEIS Frontend

A357812 Number of subsets of [n] in which exactly half of the elements are powers of 2.

Table of values

List of values