n | a(n) |
---|---|
2 | 2 |
3 | 6 |
4 | 12 |
5 | 32 |
6 | 120 |
7 | 580 |
8 | 3392 |
9 | 23244 |
10 | 182776 |
11 | 1622468 |
12 | 16045200 |
13 | 174894172 |
14 | 2082824744 |
15 | 26902998516 |
16 | 374570250688 |
17 | 5591767768460 |
18 | 89095070783832 |
19 | 1509041577895204 |
20 | 27073887615758576 |
21 | 512898265609845948 |
22 | 10230945527263709320 |
23 | 214337863242231108692 |
[2,6,12,32,120,580,3392,23244,182776,1622468, 16045200,174894172,2082824744,26902998516, 374570250688,5591767768460,89095070783832, 1509041577895204,27073887615758576, 512898265609845948,10230945527263709320, 214337863242231108692] |