The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 18 |
| 3 | 804 |
| 4 | 70980 |
| 5 | 10436805 |
| 6 | 2303750526 |
| 7 | 712510404592 |
| 8 | 294018013725192 |
| 9 | 156070751204023425 |
| 10 | 103597044789173411410 |
| 11 | 84072367255899882570876 |
| 12 | 81892130447332894817380044 |
| 13 | 94289343231845338982163322837 |
| 14 | 126676207083751543195799431746150 |
| 15 | 196394200592428254386554058525461440 |
[1,18,804,70980,10436805,2303750526,712510404592, 294018013725192,156070751204023425, 103597044789173411410,84072367255899882570876, 81892130447332894817380044, 94289343231845338982163322837, 126676207083751543195799431746150, 196394200592428254386554058525461440] |