A117748 - OEIS

A117748 as a simple table

n	a(n)
1	0
2	3
3	6
4	15
5	21
6	36
7	45
8	66
9	78
10	105
11	120
12	153
13	171
14	210
15	231
16	276
17	300
18	351
19	378
20	435
21	465
22	528
23	561
24	630
25	666
26	741
27	780
28	861
29	903
30	990
31	1035
32	1128
33	1176
34	1275
35	1326
36	1431
37	1485
38	1596
39	1653
40	1770
41	1830
42	1953
43	2016
44	2145
45	2211
46	2346
47	2415
48	2556
49	2628
50	2775

[0,3,6,15,21,36,45,66,78,105,120,153,171,210,231, 276,300,351,378,435,465,528,561,630,666,741,780, 861,903,990,1035,1128,1176,1275,1326,1431,1485, 1596,1653,1770,1830,1953,2016,2145,2211,2346,2415, 2556,2628,2775]