n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 24 |
3 | 150 |
4 | 840 |
5 | 4410 |
6 | 22176 |
7 | 108108 |
8 | 514800 |
9 | 2406690 |
10 | 11085360 |
11 | 50438388 |
12 | 227149104 |
13 | 1014058500 |
14 | 4493059200 |
15 | 19777483800 |
16 | 86555576160 |
17 | 376877404530 |
18 | 1633524354000 |
19 | 7051380128100 |
20 | 30326236340400 |
21 | 129989276677260 |
22 | 555482126422080 |
23 | 2367111334185000 |
24 | 10061252349127200 |
[0,3,24,150,840,4410,22176,108108,514800,2406690, 11085360,50438388,227149104,1014058500,4493059200, 19777483800,86555576160,376877404530, 1633524354000,7051380128100,30326236340400, 129989276677260,555482126422080,2367111334185000, 10061252349127200] |