n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 201 |
7 | 845 |
8 | 3801 |
9 | 18089 |
10 | 90316 |
11 | 470010 |
12 | 2536077 |
13 | 14127741 |
14 | 80966690 |
15 | 475979359 |
16 | 2863157581 |
17 | 17585971037 |
18 | 110095460224 |
19 | 701418693025 |
20 | 4541497543092 |
21 | 29847982448766 |
22 | 198913925919741 |
23 | 1342890255133042 |
24 | 9176456969273844 |
25 | 63422002415068463 |
[1,1,2,5,15,52,201,845,3801,18089,90316,470010, 2536077,14127741,80966690,475979359,2863157581, 17585971037,110095460224,701418693025, 4541497543092,29847982448766,198913925919741, 1342890255133042,9176456969273844, 63422002415068463] |