A188278 - OEIS

A188278 as a simple table

n	a(n)
1	3
2	6
3	10
4	15
5	21
6	30
7	38
8	47
9	59
10	70
11	82
12	99
13	113
14	128
15	144
16	163
17	181
18	204
19	226
20	249
21	271
22	294
23	318
24	347
25	375
26	402
27	434
28	465
29	497
30	530
31	562
32	597
33	631
34	670
35	706
36	749
37	787
38	828
39	870
40	915
41	961
42	1006
43	1050
44	1097
45	1145
46	1196
47	1244
48	1299
49	1349
50	1402
51	1456
52	1509
53	1567

[3,6,10,15,21,30,38,47,59,70,82,99,113,128,144, 163,181,204,226,249,271,294,318,347,375,402,434, 465,497,530,562,597,631,670,706,749,787,828,870, 915,961,1006,1050,1097,1145,1196,1244,1299,1349, 1402,1456,1509,1567]