The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 25 |
| 4 | 200 |
| 5 | 1948 |
| 6 | 23293 |
| 7 | 366698 |
| 8 | 8669713 |
| 9 | 354287410 |
| 10 | 26296911212 |
| 11 | 3452678049185 |
| 12 | 778932197922145 |
| 13 | 297680194679224221 |
| 14 | 192063113715788790619 |
| 15 | 208413189299565620902495 |
| 16 | 381159431868835826320370849 |
| 17 | 1171978295935406653806412222411 |
[1,1,4,25,200,1948,23293,366698,8669713,354287410, 26296911212,3452678049185,778932197922145, 297680194679224221,192063113715788790619, 208413189299565620902495, 381159431868835826320370849, 1171978295935406653806412222411] |