A365315 - cp's OEIS frontend

A365315 Number of unordered pairs of distinct positive integers <= n that can be linearly combined using positive coefficients to obtain n.

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	4
6	5
7	8
8	10
9	12
10	15
11	18
12	20
13	24
14	28
15	28
16	35
17	37
18	42
19	44
20	49
21	49
22	60
23	59
24	66
25	65
26	79
27	74
28	85
29	84
30	93
31	93
32	107
33	100
34	120
35	104
36	126
37	121
38	142
39	129
40	145
41	140
42	160
43	150
44	173
45	154
46	189
47	170
48	196
49	176
50	208
51	193
52	223
53	202
54	238
55	203
56	241
57	227
58	267
59	235

[0, 0, 0, 1, 2, 4, 5, 8, 10, 12, 15, 18, 20, 24, 28, 28, 35, 37, 42, 44, 49, 49, 60, 59, 66, 65, 79, 74, 85, 84, 93, 93, 107, 100, 120, 104, 126, 121, 142, 129, 145, 140, 160, 150, 173, 154, 189, 170, 196, 176, 208, 193, 223, 202, 238, 203, 241, 227, 267, 235]

cp's OEIS Frontend

A365315 Number of unordered pairs of distinct positive integers <= n that can be linearly combined using positive coefficients to obtain n.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	4
6	5
7	8
8	10
9	12
10	15
11	18
12	20
13	24
14	28
15	28
16	35
17	37
18	42
19	44
20	49
21	49
22	60
23	59
24	66
25	65
26	79
27	74
28	85
29	84
30	93
31	93
32	107
33	100
34	120
35	104
36	126
37	121
38	142
39	129
40	145
41	140
42	160
43	150
44	173
45	154
46	189
47	170
48	196
49	176
50	208
51	193
52	223
53	202
54	238
55	203
56	241
57	227
58	267
59	235

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	4
6	5
7	8
8	10
9	12
10	15
11	18
12	20
13	24
14	28
15	28
16	35
17	37
18	42
19	44
20	49
21	49
22	60
23	59
24	66
25	65
26	79
27	74
28	85
29	84
30	93
31	93
32	107
33	100
34	120
35	104
36	126
37	121
38	142
39	129
40	145
41	140
42	160
43	150
44	173
45	154
46	189
47	170
48	196
49	176
50	208
51	193
52	223
53	202
54	238
55	203
56	241
57	227
58	267
59	235

n	a(n)
0	0
1	0
2	0
3	1
4	2
5	4
6	5
7	8
8	10
9	12
10	15
11	18
12	20
13	24
14	28
15	28
16	35
17	37
18	42
19	44
20	49
21	49
22	60
23	59
24	66
25	65
26	79
27	74
28	85
29	84
30	93
31	93
32	107
33	100
34	120
35	104
36	126
37	121
38	142
39	129
40	145
41	140
42	160
43	150
44	173
45	154
46	189
47	170
48	196
49	176
50	208
51	193
52	223
53	202
54	238
55	203
56	241
57	227
58	267
59	235