n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 50 |
4 | 295 |
5 | 1792 |
6 | 11088 |
7 | 69498 |
8 | 439791 |
9 | 2803658 |
10 | 17978389 |
11 | 115837592 |
12 | 749321716 |
13 | 4863369656 |
14 | 31655226108 |
15 | 206549749930 |
16 | 1350638103791 |
17 | 8848643946550 |
18 | 58069093513635 |
19 | 381650672631330 |
20 | 2511733593767295 |
21 | 16550500379912640 |
22 | 109176697072162080 |
[1,2,9,50,295,1792,11088,69498,439791,2803658, 17978389,115837592,749321716,4863369656, 31655226108,206549749930,1350638103791, 8848643946550,58069093513635,381650672631330, 2511733593767295,16550500379912640, 109176697072162080] |