n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 53 |
5 | 217 |
6 | 1011 |
7 | 5260 |
8 | 30041 |
9 | 185677 |
10 | 1228209 |
11 | 8620874 |
12 | 63792445 |
13 | 495163451 |
14 | 4015888557 |
15 | 33923543492 |
16 | 297706713081 |
17 | 2708377382444 |
18 | 25495655264883 |
19 | 247952347547483 |
20 | 2487743315817023 |
21 | 25717746952124842 |
[1,2,5,15,53,217,1011,5260,30041,185677,1228209, 8620874,63792445,495163451,4015888557,33923543492, 297706713081,2708377382444,25495655264883, 247952347547483,2487743315817023, 25717746952124842] |