A085489 - cp's OEIS frontend

A085489 a(n) is the number of subsets of {1,...,n} containing no solutions to x+y=z with x and y distinct (one version of "sum-free subsets").

n	a(n)
0	1
1	2
2	4
3	7
4	13
5	22
6	37
7	61
8	102
9	162
10	261
11	410
12	646
13	1001
14	1553
15	2370
16	3645
17	5515
18	8303
19	12470
20	18713
21	27811
22	41244
23	60962
24	89733
25	131870
26	192522
27	281125
28	408680
29	593880
30	855661
31	1238592
32	1779614
33	2563476
34	3660084
35	5255913
36	7473380
37	10696444
38	15137517

[1, 2, 4, 7, 13, 22, 37, 61, 102, 162, 261, 410, 646, 1001, 1553, 2370, 3645, 5515, 8303, 12470, 18713, 27811, 41244, 60962, 89733, 131870, 192522, 281125, 408680, 593880, 855661, 1238592, 1779614, 2563476, 3660084, 5255913, 7473380, 10696444, 15137517]

cp's OEIS Frontend

A085489 a(n) is the number of subsets of {1,...,n} containing no solutions to x+y=z with x and y distinct (one version of "sum-free subsets").

Table of values

List of values