| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 352 |
| 3 | 3376 |
| 4 | 19648 |
| 5 | 82256 |
| 6 | 273440 |
| 7 | 767600 |
| 8 | 1894784 |
| 9 | 4228752 |
| 10 | 8703712 |
| 11 | 16763824 |
| 12 | 30549568 |
| 13 | 53125072 |
| 14 | 88750496 |
| 15 | 143203568 |
| 16 | 224154368 |
| 17 | 341597456 |
| 18 | 508345440 |
| 19 | 740588080 |
| 20 | 1058521024 |
| 21 | 1487048272 |
[1,16,352,3376,19648,82256,273440,767600,1894784, 4228752,8703712,16763824,30549568,53125072, 88750496,143203568,224154368,341597456,508345440, 740588080,1058521024,1487048272] |