The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 21 |
| 3 | 1408 |
| 4 | 196053 |
| 5 | 46587905 |
| 6 | 16875270660 |
| 7 | 8657594647800 |
| 8 | 5974284925007685 |
| 9 | 5336898188553325075 |
| 10 | 5992171630749371157181 |
| 11 | 8260051854943114812198756 |
| 12 | 13714895317396748230146099660 |
| 13 | 26998129079190909699998105620908 |
| 14 | 62173633286588800021263427046090792 |
[1,1,21,1408,196053,46587905,16875270660, 8657594647800,5974284925007685, 5336898188553325075,5992171630749371157181, 8260051854943114812198756, 13714895317396748230146099660, 26998129079190909699998105620908, 62173633286588800021263427046090792] |