n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 40 |
6 | 150 |
7 | 546 |
8 | 2128 |
9 | 8352 |
10 | 34380 |
11 | 144100 |
12 | 626736 |
13 | 2784288 |
14 | 12753832 |
15 | 59692920 |
16 | 286857600 |
17 | 1407536896 |
18 | 7069630608 |
19 | 36217682352 |
20 | 189489626560 |
21 | 1010037302400 |
22 | 5488251406176 |
23 | 30348031302688 |
24 | 170812160339712 |
[0,1,3,12,40,150,546,2128,8352,34380,144100, 626736,2784288,12753832,59692920,286857600, 1407536896,7069630608,36217682352,189489626560, 1010037302400,5488251406176,30348031302688, 170812160339712] |