n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 25 |
5 | 130 |
6 | 810 |
7 | 5880 |
8 | 48790 |
9 | 455491 |
10 | 4725020 |
11 | 53915730 |
12 | 671141130 |
13 | 9050528630 |
14 | 131437406100 |
15 | 2045160117000 |
16 | 33944105995801 |
17 | 598591246152934 |
18 | 11176863039391538 |
19 | 220287874849834596 |
20 | 4570225746232479690 |
21 | 99557506547622369750 |
22 | 2272028399094852806100 |
[1,1,2,6,25,130,810,5880,48790,455491,4725020, 53915730,671141130,9050528630,131437406100, 2045160117000,33944105995801,598591246152934, 11176863039391538,220287874849834596, 4570225746232479690,99557506547622369750, 2272028399094852806100] |