n | a(n) |
---|---|
1 | 1 |
2 | 20 |
3 | 225 |
4 | 1925 |
5 | 14014 |
6 | 91728 |
7 | 556920 |
8 | 3197700 |
9 | 17587350 |
10 | 93486536 |
11 | 483367885 |
12 | 2442687975 |
13 | 12109051500 |
14 | 59053512000 |
15 | 283963030560 |
16 | 1348824395160 |
17 | 6338392712550 |
18 | 29503515951000 |
19 | 136173391604250 |
[1,20,225,1925,14014,91728,556920,3197700, 17587350,93486536,483367885,2442687975, 12109051500,59053512000,283963030560, 1348824395160,6338392712550,29503515951000, 136173391604250] |