n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 6 |
5 | 10 |
6 | 55 |
7 | 66 |
8 | 300 |
9 | 666 |
10 | 990 |
11 | 3003 |
12 | 5050 |
13 | 10011 |
14 | 66066 |
15 | 500500 |
16 | 600060 |
17 | 50005000 |
18 | 5000050000 |
19 | 500000500000 |
20 | 50000005000000 |
21 | 5000000050000000 |
22 | 500000000500000000 |
23 | 50000000005000000000 |
24 | 5000000000050000000000 |
25 | 500000000000500000000000 |
26 | 50000000000005000000000000 |
[0,1,3,6,10,55,66,300,666,990,3003,5050,10011, 66066,500500,600060,50005000,5000050000, 500000500000,50000005000000,5000000050000000, 500000000500000000,50000000005000000000, 5000000000050000000000,500000000000500000000000, 50000000000005000000000000] |