The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 42 |
| 3 | 2000 |
| 4 | 170660 |
| 5 | 22741992 |
| 6 | 4344779208 |
| 7 | 1123066676160 |
| 8 | 376718037181200 |
| 9 | 158895919895100960 |
| 10 | 82222168141278271392 |
| 11 | 51172838316787466103552 |
| 12 | 37687233953299944682503744 |
| 13 | 32399590493755848692815785600 |
| 14 | 32140659218911596667452247171200 |
[1,2,42,2000,170660,22741992,4344779208, 1123066676160,376718037181200,158895919895100960, 82222168141278271392,51172838316787466103552, 37687233953299944682503744, 32399590493755848692815785600, 32140659218911596667452247171200] |