The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 295 |
| 4 | 10812 |
| 5 | 852448 |
| 6 | 144733702 |
| 7 | 55080396536 |
| 8 | 46897992282392 |
| 9 | 90347796732080200 |
| 10 | 391616769266718212264 |
| 11 | 3836378499038367303867568 |
| 12 | 84709934712009857654653118434 |
| 13 | 4225407805631534612606491862152228 |
[2,16,295,10812,852448,144733702,55080396536, 46897992282392,90347796732080200, 391616769266718212264,3836378499038367303867568, 84709934712009857654653118434, 4225407805631534612606491862152228] |