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| n | a(n) |
|---|---|
| 0 | 5 |
| 1 | 2 |
| 2 | 5 |
| 3 | 20 |
| 4 | 100 |
| 5 | 570 |
| 6 | 3542 |
| 7 | 23400 |
| 8 | 161820 |
| 9 | 1159400 |
| 10 | 8544965 |
| 11 | 64448228 |
| 12 | 495508780 |
| 13 | 3872033900 |
| 14 | 30680401500 |
| 15 | 246041115600 |
| 16 | 1993987498284 |
| 17 | 16310419381080 |
| 18 | 134519771966180 |
| 19 | 1117653277802000 |
| 20 | 9347742311507600 |
| 21 | 78652006531467930 |
| 22 | 665393840873409150 |
| 23 | 5657273782416664200 |
| 24 | 48318619683648190500 |
[5,2,5,20,100,570,3542,23400,161820,1159400, 8544965,64448228,495508780,3872033900,30680401500, 246041115600,1993987498284,16310419381080, 134519771966180,1117653277802000,9347742311507600, 78652006531467930,665393840873409150, 5657273782416664200,48318619683648190500] |