n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 53 |
5 | 223 |
6 | 1034 |
7 | 5221 |
8 | 28437 |
9 | 165859 |
10 | 1029803 |
11 | 6772850 |
12 | 46983238 |
13 | 342509396 |
14 | 2615606677 |
15 | 20865444825 |
16 | 173446634597 |
17 | 1499111445237 |
18 | 13445550920288 |
19 | 124919896067530 |
20 | 1200320663197275 |
21 | 11910845573790488 |
[0,1,4,14,53,223,1034,5221,28437,165859,1029803, 6772850,46983238,342509396,2615606677,20865444825, 173446634597,1499111445237,13445550920288, 124919896067530,1200320663197275, 11910845573790488] |