n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 6 |
4 | 9 |
5 | 24 |
6 | 146 |
7 | 217 |
8 | 445 |
9 | 550 |
10 | 5959 |
11 | 14251 |
12 | 63336 |
13 | 118471 |
14 | 183456 |
15 | 951699 |
16 | 3458333 |
17 | 6284059 |
18 | 2581690 |
19 | 80743227 |
20 | 259753424 |
[0,1,6,9,24,146,217,445,550,5959,14251,63336, 118471,183456,951699,3458333,6284059,2581690, 80743227,259753424] |