n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 45 |
6 | 224 |
7 | 1568 |
8 | 10763 |
9 | 96867 |
10 | 840122 |
11 | 9241342 |
12 | 96502325 |
13 | 1254530225 |
14 | 15299599194 |
15 | 229493987910 |
16 | 3199636182647 |
17 | 54393815104999 |
18 | 853245337600170 |
19 | 16211661414403230 |
20 | 282567703716447041 |
21 | 5933921778045387861 |
22 | 113771512251159523658 |
[1,1,1,3,9,45,224,1568,10763,96867,840122,9241342, 96502325,1254530225,15299599194,229493987910, 3199636182647,54393815104999,853245337600170, 16211661414403230,282567703716447041, 5933921778045387861,113771512251159523658] |