A025736 - OEIS

A025736 as a simple table

n	a(n)
1	1
2	3
3	6
4	10
5	15
6	22
7	30
8	39
9	49
10	61
11	74
12	88
13	103
14	119
15	137
16	156
17	176
18	197
19	220
20	244
21	269
22	295
23	322
24	351
25	381
26	412
27	444
28	478
29	513
30	549
31	586
32	625
33	665
34	706
35	748
36	791
37	836
38	882
39	929
40	977
41	1027
42	1078
43	1130
44	1183
45	1237
46	1293
47	1350
48	1408
49	1467
50	1528
51	1590
52	1653
53	1717

[1,3,6,10,15,22,30,39,49,61,74,88,103,119,137,156, 176,197,220,244,269,295,322,351,381,412,444,478, 513,549,586,625,665,706,748,791,836,882,929,977, 1027,1078,1130,1183,1237,1293,1350,1408,1467,1528, 1590,1653,1717]