n | a(n) |
---|---|
0 | 0 |
1 | 15 |
2 | 55 |
3 | 120 |
4 | 210 |
5 | 325 |
6 | 465 |
7 | 630 |
8 | 820 |
9 | 1035 |
10 | 1275 |
11 | 1540 |
12 | 1830 |
13 | 2145 |
14 | 2485 |
15 | 2850 |
16 | 3240 |
17 | 3655 |
18 | 4095 |
19 | 4560 |
20 | 5050 |
21 | 5565 |
22 | 6105 |
23 | 6670 |
24 | 7260 |
25 | 7875 |
26 | 8515 |
27 | 9180 |
28 | 9870 |
29 | 10585 |
30 | 11325 |
31 | 12090 |
32 | 12880 |
33 | 13695 |
34 | 14535 |
35 | 15400 |
36 | 16290 |
37 | 17205 |
38 | 18145 |
39 | 19110 |
40 | 20100 |
[0,15,55,120,210,325,465,630,820,1035,1275,1540, 1830,2145,2485,2850,3240,3655,4095,4560,5050,5565, 6105,6670,7260,7875,8515,9180,9870,10585,11325, 12090,12880,13695,14535,15400,16290,17205,18145, 19110,20100] |