A088810 - cp's OEIS frontend

A088810 Number of subsets of {1, ..., n} that are double-free but not sum-free.

n	a(n)
0	0
1	0
2	0
3	0
4	1
5	4
6	6
7	18
8	35
9	84
10	137
11	323
12	591
13	1313
14	2033
15	4360
16	7406
17	15581
18	23682
19	49184
20	84017
21	171744
22	259818
23	528784
24	853143
25	1727011
26	2601181
27	5243126
28	8784832
29	17662987
30	26541257
31	53279330
32	86241323
33	172871156
34	259534578
35	519917139

[0, 0, 0, 0, 1, 4, 6, 18, 35, 84, 137, 323, 591, 1313, 2033, 4360, 7406, 15581, 23682, 49184, 84017, 171744, 259818, 528784, 853143, 1727011, 2601181, 5243126, 8784832, 17662987, 26541257, 53279330, 86241323, 172871156, 259534578, 519917139]

cp's OEIS Frontend

A088810 Number of subsets of {1, ..., n} that are double-free but not sum-free.

Table of values

List of values