n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 20 |
4 | 96 |
5 | 644 |
6 | 5839 |
7 | 67834 |
8 | 970568 |
9 | 16256556 |
10 | 308620966 |
11 | 6506035400 |
12 | 150358570914 |
13 | 3775903806928 |
14 | 102348067516576 |
15 | 2977979542305736 |
16 | 92579723269733557 |
17 | 3062602106878957610 |
18 | 107418879166917701583 |
19 | 3981908920500346885116 |
20 | 155550644128029095714786 |
[1,2,5,20,96,644,5839,67834,970568,16256556, 308620966,6506035400,150358570914,3775903806928, 102348067516576,2977979542305736, 92579723269733557,3062602106878957610, 107418879166917701583,3981908920500346885116, 155550644128029095714786] |