n | a(n) |
---|---|
0 | 2 |
1 | 3 |
2 | 12 |
3 | 60 |
4 | 330 |
5 | 1911 |
6 | 11424 |
7 | 69768 |
8 | 432630 |
9 | 2713425 |
10 | 17168580 |
11 | 109390320 |
12 | 700939512 |
13 | 4512458580 |
14 | 29164264320 |
15 | 189120846288 |
16 | 1229917589262 |
17 | 8018580361365 |
18 | 52392620853300 |
19 | 342991368096300 |
20 | 2249282417749290 |
[2,3,12,60,330,1911,11424,69768,432630,2713425, 17168580,109390320,700939512,4512458580, 29164264320,189120846288,1229917589262, 8018580361365,52392620853300,342991368096300, 2249282417749290] |