A357292 - cp's OEIS frontend

A357292 a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least two elements of S) = difference between greatest two elements of S.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	1
6	2
7	5
8	11
9	23
10	47
11	96
12	193
13	388
14	778
15	1558
16	3118
17	6239
18	12480
19	24963
20	49929
21	99861
22	199725
23	399454
24	798911
25	1597826
26	3195656
27	6391316
28	12782636
29	25565277
30	51130558
31	102261121
32	204522247
33	409044499
34	818089003
35	1636178012
36	3272356029

[0, 0, 0, 0, 0, 1, 2, 5, 11, 23, 47, 96, 193, 388, 778, 1558, 3118, 6239, 12480, 24963, 49929, 99861, 199725, 399454, 798911, 1597826, 3195656, 6391316, 12782636, 25565277, 51130558, 102261121, 204522247, 409044499, 818089003, 1636178012, 3272356029]

cp's OEIS Frontend

A357292 a(n) = number of subsets S of {1,2,...,n} having more than 2 elements such that (sum of least two elements of S) = difference between greatest two elements of S.

Table of values

List of values