n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 15 |
4 | 60 |
5 | 340 |
6 | 1680 |
7 | 9135 |
8 | 48440 |
9 | 264726 |
10 | 1446060 |
11 | 7996296 |
12 | 44396352 |
13 | 248133600 |
14 | 1392623232 |
15 | 7850732175 |
16 | 44413669872 |
17 | 252098234674 |
18 | 1435074678180 |
19 | 8190821465970 |
20 | 46860693370920 |
21 | 268676908816680 |
22 | 1543504863288960 |
23 | 8883248453674920 |
24 | 51210412534906560 |
[1,2,15,60,340,1680,9135,48440,264726,1446060, 7996296,44396352,248133600,1392623232,7850732175, 44413669872,252098234674,1435074678180, 8190821465970,46860693370920,268676908816680, 1543504863288960,8883248453674920, 51210412534906560] |