n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 8 |
3 | 44 |
4 | 300 |
5 | 2408 |
6 | 22056 |
7 | 225824 |
8 | 2547352 |
9 | 31322640 |
10 | 416442016 |
11 | 5948450912 |
12 | 90815006528 |
13 | 1475513165184 |
14 | 25419300628160 |
15 | 462839142264960 |
16 | 8882065110092000 |
17 | 179190173518717120 |
18 | 3791700201187720960 |
19 | 83977684252758211200 |
20 | 1942984028971973710720 |
[1,2,8,44,300,2408,22056,225824,2547352,31322640, 416442016,5948450912,90815006528,1475513165184, 25419300628160,462839142264960,8882065110092000, 179190173518717120,3791700201187720960, 83977684252758211200,1942984028971973710720] |