A002415 - OEIS

A002415 as a simple table

n	a(n)
0	0
1	0
2	1
3	6
4	20
5	50
6	105
7	196
8	336
9	540
10	825
11	1210
12	1716
13	2366
14	3185
15	4200
16	5440
17	6936
18	8721
19	10830
20	13300
21	16170
22	19481
23	23276
24	27600
25	32500
26	38025
27	44226
28	51156
29	58870
30	67425
31	76880
32	87296
33	98736
34	111265
35	124950
36	139860
37	156066
38	173641
39	192660
40	213200
41	235340

[0,0,1,6,20,50,105,196,336,540,825,1210,1716,2366, 3185,4200,5440,6936,8721,10830,13300,16170,19481, 23276,27600,32500,38025,44226,51156,58870,67425, 76880,87296,98736,111265,124950,139860,156066, 173641,192660,213200,235340]