n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 9 |
4 | 68 |
5 | 490 |
6 | 5184 |
7 | 53928 |
8 | 696352 |
9 | 9545184 |
10 | 147901680 |
11 | 2437886880 |
12 | 44593856064 |
13 | 861936989472 |
14 | 17988878376000 |
15 | 398199273907680 |
16 | 9386173867046400 |
17 | 233068382185213440 |
18 | 6117261434418069504 |
19 | 168414066137504272896 |
20 | 4867992707164288773120 |
21 | 147081824197157871866880 |
22 | 4641822165217412602183680 |
[1,0,2,9,68,490,5184,53928,696352,9545184, 147901680,2437886880,44593856064,861936989472, 17988878376000,398199273907680,9386173867046400, 233068382185213440,6117261434418069504, 168414066137504272896,4867992707164288773120, 147081824197157871866880, 4641822165217412602183680] |