A339569 - cp's OEIS frontend

A339569 Number of subsets of {1..n} whose cardinality is equal to the root-mean-square of the elements.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	3
10	4
11	5
12	10
13	16
14	32
15	56
16	90
17	134
18	186
19	304
20	476
21	746
22	1308
23	2522
24	4845
25	9129
26	17260
27	32684
28	59908
29	106181
30	191779
31	337793
32	596689
33	1061991
34	1907311
35	3518903
36	6426672
37	12093858
38	22777645
39	42886411
40	81002076
41	151575988
42	285280108
43	529313088

[1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 5, 10, 16, 32, 56, 90, 134, 186, 304, 476, 746, 1308, 2522, 4845, 9129, 17260, 32684, 59908, 106181, 191779, 337793, 596689, 1061991, 1907311, 3518903, 6426672, 12093858, 22777645, 42886411, 81002076, 151575988, 285280108, 529313088]

cp's OEIS Frontend

A339569 Number of subsets of {1..n} whose cardinality is equal to the root-mean-square of the elements.

Table of values

List of values