n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 12 |
4 | 36 |
5 | 120 |
6 | 400 |
7 | 1520 |
8 | 5776 |
9 | 23712 |
10 | 97344 |
11 | 431808 |
12 | 1915456 |
13 | 9012608 |
14 | 42406144 |
15 | 210988800 |
16 | 1049760000 |
17 | 5475340800 |
18 | 28558296064 |
19 | 155672726528 |
20 | 848579961856 |
21 | 4810614454272 |
22 | 27271456395264 |
23 | 160376430784512 |
24 | 943132599095296 |
25 | 5735299537018880 |
[1,2,4,12,36,120,400,1520,5776,23712,97344,431808, 1915456,9012608,42406144,210988800,1049760000, 5475340800,28558296064,155672726528,848579961856, 4810614454272,27271456395264,160376430784512, 943132599095296,5735299537018880] |