A112355 - OEIS

A112355 as a simple table

n	a(n)
1	3
2	10
3	15
4	21
5	28
6	36
7	45
8	55
9	66
10	78
11	91
12	105
13	120
14	136
15	153
16	171
17	190
18	210
19	231
20	253
21	276
22	300
23	325
24	351
25	378
26	406
27	435
28	465
29	496
30	528
31	561
32	595
33	630
34	666
35	703
36	741
37	780
38	820
39	861
40	903
41	946
42	990
43	1035
44	1081
45	1128
46	1176
47	1225
48	1275
49	1326

[3,10,15,21,28,36,45,55,66,78,91,105,120,136,153, 171,190,210,231,253,276,300,325,351,378,406,435, 465,496,528,561,595,630,666,703,741,780,820,861, 903,946,990,1035,1081,1128,1176,1225,1275,1326]