n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 20 |
4 | 88 |
5 | 432 |
6 | 2464 |
7 | 14912 |
8 | 111360 |
9 | 912896 |
10 | 8491264 |
11 | 80905728 |
12 | 861835264 |
13 | 9524264960 |
14 | 113218762752 |
15 | 1362387243008 |
16 | 20665650774016 |
17 | 337892698226688 |
18 | 6100999266304000 |
19 | 106342541313572864 |
20 | 2014622956858638336 |
21 | 37864490015441027072 |
[1,2,6,20,88,432,2464,14912,111360,912896,8491264, 80905728,861835264,9524264960,113218762752, 1362387243008,20665650774016,337892698226688, 6100999266304000,106342541313572864, 2014622956858638336,37864490015441027072] |