The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 14 |
| 3 | 264 |
| 4 | 21512 |
| 5 | 5663596 |
| 6 | 6478476233 |
| 7 | 23432328776346 |
| 8 | 365121393771314359 |
| 9 | 18039965927005597824652 |
| 10 | 3847346539490622663060402802 |
| 11 | 2604549807872636495439504536518768 |
| 12 | 7613280873970130888072912524910312775000 |
| 13 | 70659728324509466176595292882340210105184200002 |
[2,14,264,21512,5663596,6478476233,23432328776346, 365121393771314359,18039965927005597824652, 3847346539490622663060402802, 2604549807872636495439504536518768, 7613280873970130888072912524910312775000, 70659728324509466176595292882340210105184200002] |