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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 46 |
| 4 | 629 |
| 5 | 11516 |
| 6 | 264967 |
| 7 | 7353802 |
| 8 | 239207369 |
| 9 | 8928133336 |
| 10 | 376180486091 |
| 11 | 17663931715574 |
| 12 | 914751037702669 |
| 13 | 51796450392492196 |
| 14 | 3183728647902158735 |
| 15 | 211123152550900375426 |
| 16 | 15024331471142190589073 |
| 17 | 1142112213489795318697904 |
| 18 | 92366879672309716539054739 |
[1,1,5,46,629,11516,264967,7353802,239207369, 8928133336,376180486091,17663931715574, 914751037702669,51796450392492196, 3183728647902158735,211123152550900375426, 15024331471142190589073,1142112213489795318697904, 92366879672309716539054739] |