n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 12 |
3 | 60 |
4 | 280 |
5 | 1260 |
6 | 5544 |
7 | 24024 |
8 | 102960 |
9 | 437580 |
10 | 1847560 |
11 | 7759752 |
12 | 32449872 |
13 | 135207800 |
14 | 561632400 |
15 | 2326762800 |
16 | 9617286240 |
17 | 39671305740 |
18 | 163352435400 |
19 | 671560012200 |
20 | 2756930576400 |
21 | 11303415363240 |
22 | 46290177201840 |
23 | 189368906734800 |
24 | 773942488394400 |
[0,2,12,60,280,1260,5544,24024,102960,437580, 1847560,7759752,32449872,135207800,561632400, 2326762800,9617286240,39671305740,163352435400, 671560012200,2756930576400,11303415363240, 46290177201840,189368906734800,773942488394400] |