The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 102 |
| 4 | 22874 |
| 5 | 17633670 |
| 6 | 46959933962 |
| 7 | 451575174961302 |
| 8 | 16271255119687320314 |
| 9 | 2253375946574190518740230 |
| 10 | 1219041140314101911449662059402 |
| 11 | 2601922592659455476330065914740044182 |
| 12 | 22040870572750372076278589658097827953983034 |
[1,0,2,102,22874,17633670,46959933962, 451575174961302,16271255119687320314, 2253375946574190518740230, 1219041140314101911449662059402, 2601922592659455476330065914740044182, 22040870572750372076278589658097827953983034] |