The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 408 |
| 3 | 69468 |
| 4 | 4242700 |
| 5 | 241796070 |
| 6 | 13010689912 |
| 7 | 669777003928 |
| 8 | 33569301548620 |
| 9 | 1648776677140184 |
| 10 | 79729758214875372 |
| 11 | 3808601116917731110 |
| 12 | 180135397053029043408 |
| 13 | 8450230315310614813812 |
| 14 | 393679533146957194152168 |
[0,408,69468,4242700,241796070,13010689912, 669777003928,33569301548620,1648776677140184, 79729758214875372,3808601116917731110, 180135397053029043408,8450230315310614813812, 393679533146957194152168] |