n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 56 |
5 | 288 |
6 | 1584 |
7 | 9152 |
8 | 54912 |
9 | 339456 |
10 | 2149888 |
11 | 13891584 |
12 | 91287552 |
13 | 608583680 |
14 | 4107939840 |
15 | 28030648320 |
16 | 193100021760 |
17 | 1341536993280 |
18 | 9390758952960 |
19 | 66182491668480 |
20 | 469294031831040 |
21 | 3346270487838720 |
22 | 23981605162844160 |
23 | 172667557172477952 |
[1,1,3,12,56,288,1584,9152,54912,339456,2149888, 13891584,91287552,608583680,4107939840, 28030648320,193100021760,1341536993280, 9390758952960,66182491668480,469294031831040, 3346270487838720,23981605162844160, 172667557172477952] |