n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 12 |
5 | 36 |
6 | 120 |
7 | 360 |
8 | 960 |
9 | 3840 |
10 | 13824 |
11 | 41472 |
12 | 152064 |
13 | 506880 |
14 | 2280960 |
15 | 7983360 |
16 | 29937600 |
17 | 99792000 |
18 | 266112000 |
19 | 1197504000 |
20 | 4790016000 |
21 | 19160064000 |
22 | 73156608000 |
23 | 219469824000 |
24 | 1009561190400 |
25 | 3533464166400 |
26 | 12563428147200 |
27 | 54441521971200 |
28 | 155547205632000 |
[1,1,2,4,12,36,120,360,960,3840,13824,41472, 152064,506880,2280960,7983360,29937600,99792000, 266112000,1197504000,4790016000,19160064000, 73156608000,219469824000,1009561190400, 3533464166400,12563428147200,54441521971200, 155547205632000] |