n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 17 |
4 | 98 |
5 | 622 |
6 | 4512 |
7 | 35373 |
8 | 300974 |
9 | 2722070 |
10 | 26118056 |
11 | 263266346 |
12 | 2780054884 |
13 | 30586452652 |
14 | 349724463584 |
15 | 4141218303165 |
16 | 50678688359190 |
17 | 639387728054310 |
18 | 8302396672724280 |
19 | 110754894628585950 |
[1,1,4,17,98,622,4512,35373,300974,2722070, 26118056,263266346,2780054884,30586452652, 349724463584,4141218303165,50678688359190, 639387728054310,8302396672724280, 110754894628585950] |