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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 7 |
| 4 | 24 |
| 5 | 120 |
| 6 | 963 |
| 7 | 4689 |
| 8 | 34739 |
| 9 | 206363 |
| 10 | 1388386 |
| 11 | 8770132 |
| 12 | 58277644 |
| 13 | 374054863 |
| 14 | 2461101248 |
| 15 | 15971848701 |
| 16 | 104543429551 |
| 17 | 680910307295 |
| 18 | 4450730822243 |
| 19 | 29026246222317 |
| 20 | 189592201754404 |
| 21 | 1237265914602821 |
| 22 | 8078981295508349 |
[0,5,7,24,120,963,4689,34739,206363,1388386, 8770132,58277644,374054863,2461101248,15971848701, 104543429551,680910307295,4450730822243, 29026246222317,189592201754404,1237265914602821, 8078981295508349] |