The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 52 |
| 4 | 918 |
| 5 | 24630 |
| 6 | 934938 |
| 7 | 47736048 |
| 8 | 3157054776 |
| 9 | 262661665176 |
| 10 | 26857133054424 |
| 11 | 3311299323349920 |
| 12 | 484541686800059760 |
| 13 | 83031688670103506160 |
| 14 | 16472545369548670950480 |
| 15 | 3746065113561656467249920 |
| 16 | 968109978211279792380074880 |
| 17 | 282158259444905145777416119680 |
[1,5,52,918,24630,934938,47736048,3157054776, 262661665176,26857133054424,3311299323349920, 484541686800059760,83031688670103506160, 16472545369548670950480,3746065113561656467249920, 968109978211279792380074880, 282158259444905145777416119680] |