n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 5 |
3 | 20 |
4 | 78 |
5 | 324 |
6 | 1520 |
7 | 8336 |
8 | 53872 |
9 | 405600 |
10 | 3492416 |
11 | 33798016 |
12 | 362543104 |
13 | 4264455168 |
14 | 54540715008 |
15 | 753246711808 |
16 | 11168972683264 |
17 | 176937613586432 |
18 | 2982069587042304 |
19 | 53271637651996672 |
20 | 1005385746384846848 |
21 | 19987620914387812352 |
22 | 417489079682758213632 |
[0,1,5,20,78,324,1520,8336,53872,405600,3492416, 33798016,362543104,4264455168,54540715008, 753246711808,11168972683264,176937613586432, 2982069587042304,53271637651996672, 1005385746384846848,19987620914387812352, 417489079682758213632] |