A176659 - OEIS

A176659 as a simple table

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	21
7	28
8	36
9	45
10	55
11	66
12	78
13	91
14	105
15	120
16	136
17	153
18	171
19	190
20	210
21	231
22	253
23	277
24	302
25	328
26	356
27	386
28	417
29	449
30	482
31	517
32	553
33	592
34	632
35	673
36	715
37	759
38	804
39	852
40	902
41	953
42	1005
43	1060
44	1120
45	1181
46	1243
47	1306
48	1370
49	1435
50	1501
51	1571
52	1642

[1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136, 153,171,190,210,231,253,277,302,328,356,386,417, 449,482,517,553,592,632,673,715,759,804,852,902, 953,1005,1060,1120,1181,1243,1306,1370,1435,1501, 1571,1642]