A247185 - cp's OEIS frontend

A247185 a(0) = 0. a(n) is the number of repeating sums in the collection of all sums of two elements in [a(0), ... a(n-1)], chosen without replacement.

n	a(n)
0	0
1	0
2	0
3	2
4	4
5	6
6	9
7	11
8	16
9	19
10	22
11	26
12	32
13	38
14	43
15	50
16	56
17	67
18	75
19	81
20	89
21	97
22	109
23	119
24	130
25	140
26	154
27	166
28	178
29	194
30	205
31	220
32	233
33	250
34	264
35	283
36	296
37	312
38	327
39	345
40	359
41	378
42	397
43	415
44	432
45	456
46	481
47	504
48	523
49	547
50	569
51	591
52	617
53	641
54	664
55	689
56	718
57	744
58	769
59	797
60	824
61	847
62	878
63	910
64	945

[0, 0, 0, 2, 4, 6, 9, 11, 16, 19, 22, 26, 32, 38, 43, 50, 56, 67, 75, 81, 89, 97, 109, 119, 130, 140, 154, 166, 178, 194, 205, 220, 233, 250, 264, 283, 296, 312, 327, 345, 359, 378, 397, 415, 432, 456, 481, 504, 523, 547, 569, 591, 617, 641, 664, 689, 718, 744, 769, 797, 824, 847, 878, 910, 945]

cp's OEIS Frontend

A247185 a(0) = 0. a(n) is the number of repeating sums in the collection of all sums of two elements in [a(0), ... a(n-1)], chosen without replacement.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	2
4	4
5	6
6	9
7	11
8	16
9	19
10	22
11	26
12	32
13	38
14	43
15	50
16	56
17	67
18	75
19	81
20	89
21	97
22	109
23	119
24	130
25	140
26	154
27	166
28	178
29	194
30	205
31	220
32	233
33	250
34	264
35	283
36	296
37	312
38	327
39	345
40	359
41	378
42	397
43	415
44	432
45	456
46	481
47	504
48	523
49	547
50	569
51	591
52	617
53	641
54	664
55	689
56	718
57	744
58	769
59	797
60	824
61	847
62	878
63	910
64	945

n	a(n)
0	0
1	0
2	0
3	2
4	4
5	6
6	9
7	11
8	16
9	19
10	22
11	26
12	32
13	38
14	43
15	50
16	56
17	67
18	75
19	81
20	89
21	97
22	109
23	119
24	130
25	140
26	154
27	166
28	178
29	194
30	205
31	220
32	233
33	250
34	264
35	283
36	296
37	312
38	327
39	345
40	359
41	378
42	397
43	415
44	432
45	456
46	481
47	504
48	523
49	547
50	569
51	591
52	617
53	641
54	664
55	689
56	718
57	744
58	769
59	797
60	824
61	847
62	878
63	910
64	945

n	a(n)
0	0
1	0
2	0
3	2
4	4
5	6
6	9
7	11
8	16
9	19
10	22
11	26
12	32
13	38
14	43
15	50
16	56
17	67
18	75
19	81
20	89
21	97
22	109
23	119
24	130
25	140
26	154
27	166
28	178
29	194
30	205
31	220
32	233
33	250
34	264
35	283
36	296
37	312
38	327
39	345
40	359
41	378
42	397
43	415
44	432
45	456
46	481
47	504
48	523
49	547
50	569
51	591
52	617
53	641
54	664
55	689
56	718
57	744
58	769
59	797
60	824
61	847
62	878
63	910
64	945