n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 3 |
3 | 23 |
4 | 164 |
5 | 1252 |
6 | 10512 |
7 | 97344 |
8 | 990432 |
9 | 11010528 |
10 | 132966720 |
11 | 1734793920 |
12 | 24330205440 |
13 | 365150833920 |
14 | 5840673108480 |
15 | 99204809356800 |
16 | 1783428104908800 |
17 | 33833306484633600 |
18 | 675513065777356800 |
19 | 14160039606855475200 |
20 | 310935875030323200000 |
[0,0,3,23,164,1252,10512,97344,990432,11010528, 132966720,1734793920,24330205440,365150833920, 5840673108480,99204809356800,1783428104908800, 33833306484633600,675513065777356800, 14160039606855475200,310935875030323200000] |