n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 13 |
4 | 62 |
5 | 352 |
6 | 2348 |
7 | 17880 |
8 | 153138 |
9 | 1458726 |
10 | 15303672 |
11 | 175387056 |
12 | 2180632824 |
13 | 29240091480 |
14 | 420683340840 |
15 | 6464876260440 |
16 | 105699125013120 |
17 | 1832140771795440 |
18 | 33562515077608320 |
19 | 647929998101403360 |
20 | 13148236101412979280 |
21 | 279809650659550924080 |
[1,1,3,13,62,352,2348,17880,153138,1458726, 15303672,175387056,2180632824,29240091480, 420683340840,6464876260440,105699125013120, 1832140771795440,33562515077608320, 647929998101403360,13148236101412979280, 279809650659550924080] |