n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 10 |
4 | 39 |
5 | 174 |
6 | 858 |
7 | 4564 |
8 | 25793 |
9 | 153301 |
10 | 951325 |
11 | 6130757 |
12 | 40861658 |
13 | 280767621 |
14 | 1983859580 |
15 | 14385651988 |
16 | 106878699675 |
17 | 812480791324 |
18 | 6312686006725 |
19 | 50083418434737 |
20 | 405430892640225 |
21 | 3346568909331984 |
[1,1,3,10,39,174,858,4564,25793,153301,951325, 6130757,40861658,280767621,1983859580,14385651988, 106878699675,812480791324,6312686006725, 50083418434737,405430892640225,3346568909331984] |