n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 6 |
5 | 34 |
6 | 216 |
7 | 1566 |
8 | 12840 |
9 | 117696 |
10 | 1193760 |
11 | 13280520 |
12 | 160841520 |
13 | 2107021680 |
14 | 29689833600 |
15 | 447821503920 |
16 | 7199590366080 |
17 | 122907276334080 |
18 | 2220524598297600 |
19 | 42328747652446080 |
20 | 849064844592518400 |
21 | 17877531486897734400 |
22 | 394246607165708774400 |
[1,0,0,1,6,34,216,1566,12840,117696,1193760, 13280520,160841520,2107021680,29689833600, 447821503920,7199590366080,122907276334080, 2220524598297600,42328747652446080, 849064844592518400,17877531486897734400, 394246607165708774400] |