A365541 - cp's OEIS frontend

A365541 Irregular triangle read by rows where T(n,k) is the number of subsets of {1..n} containing two distinct elements summing to k = 3..2n-1.

n	a(n)
2	1
3	2
4	2
5	2
6	4
7	4
8	7
9	4
10	4
11	8
12	8
13	14
14	14
15	14
16	8
17	8
18	16
19	16
20	28
21	28
22	37
23	28
24	28
25	16
26	16
27	32
28	32
29	56
30	56
31	74
32	74
33	74
34	56
35	56
36	32
37	32
38	64
39	64
40	112
41	112
42	148
43	148
44	175
45	148
46	148
47	112
48	112
49	64
50	64
51	128
52	128
53	224
54	224
55	296
56	296
57	350
58	350
59	350
60	296
61	296
62	224
63	224
64	128
65	128

[1, 2, 2, 2, 4, 4, 7, 4, 4, 8, 8, 14, 14, 14, 8, 8, 16, 16, 28, 28, 37, 28, 28, 16, 16, 32, 32, 56, 56, 74, 74, 74, 56, 56, 32, 32, 64, 64, 112, 112, 148, 148, 175, 148, 148, 112, 112, 64, 64, 128, 128, 224, 224, 296, 296, 350, 350, 350, 296, 296, 224, 224, 128, 128]

cp's OEIS Frontend

A365541 Irregular triangle read by rows where T(n,k) is the number of subsets of {1..n} containing two distinct elements summing to k = 3..2n-1.

Table of values

List of values

n	a(n)
2	1
3	2
4	2
5	2
6	4
7	4
8	7
9	4
10	4
11	8
12	8
13	14
14	14
15	14
16	8
17	8
18	16
19	16
20	28
21	28
22	37
23	28
24	28
25	16
26	16
27	32
28	32
29	56
30	56
31	74
32	74
33	74
34	56
35	56
36	32
37	32
38	64
39	64
40	112
41	112
42	148
43	148
44	175
45	148
46	148
47	112
48	112
49	64
50	64
51	128
52	128
53	224
54	224
55	296
56	296
57	350
58	350
59	350
60	296
61	296
62	224
63	224
64	128
65	128

n	a(n)
2	1
3	2
4	2
5	2
6	4
7	4
8	7
9	4
10	4
11	8
12	8
13	14
14	14
15	14
16	8
17	8
18	16
19	16
20	28
21	28
22	37
23	28
24	28
25	16
26	16
27	32
28	32
29	56
30	56
31	74
32	74
33	74
34	56
35	56
36	32
37	32
38	64
39	64
40	112
41	112
42	148
43	148
44	175
45	148
46	148
47	112
48	112
49	64
50	64
51	128
52	128
53	224
54	224
55	296
56	296
57	350
58	350
59	350
60	296
61	296
62	224
63	224
64	128
65	128

n	a(n)
2	1
3	2
4	2
5	2
6	4
7	4
8	7
9	4
10	4
11	8
12	8
13	14
14	14
15	14
16	8
17	8
18	16
19	16
20	28
21	28
22	37
23	28
24	28
25	16
26	16
27	32
28	32
29	56
30	56
31	74
32	74
33	74
34	56
35	56
36	32
37	32
38	64
39	64
40	112
41	112
42	148
43	148
44	175
45	148
46	148
47	112
48	112
49	64
50	64
51	128
52	128
53	224
54	224
55	296
56	296
57	350
58	350
59	350
60	296
61	296
62	224
63	224
64	128
65	128