A129966 - OEIS

A129966 as a simple table

n	a(n)
1	0
2	1
3	3
4	15
5	21
6	28
7	36
8	45
9	55
10	91
11	105
12	120
13	136
14	153
15	171
16	231
17	253
18	276
19	300
20	325
21	351
22	435
23	465
24	496
25	528
26	561
27	595
28	703
29	741
30	780
31	820
32	861
33	903
34	1035
35	1081
36	1128
37	1176
38	1225
39	1275
40	1431
41	1485
42	1540
43	1596
44	1653
45	1711
46	1891
47	1953

[0,1,3,15,21,28,36,45,55,91,105,120,136,153,171, 231,253,276,300,325,351,435,465,496,528,561,595, 703,741,780,820,861,903,1035,1081,1128,1176,1225, 1275,1431,1485,1540,1596,1653,1711,1891,1953]