The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 561 |
| 3 | 14178 |
| 4 | 276427 |
| 5 | 4249486 |
| 6 | 53817407 |
| 7 | 581588614 |
| 8 | 5503143135 |
| 9 | 46473256070 |
| 10 | 355407459056 |
| 11 | 2489794107266 |
| 12 | 16126296889260 |
| 13 | 97309331427298 |
| 14 | 550557601317077 |
| 15 | 2936599872342895 |
| 16 | 14836021866212493 |
| 17 | 71284139688101545 |
[20,561,14178,276427,4249486,53817407,581588614, 5503143135,46473256070,355407459056,2489794107266, 16126296889260,97309331427298,550557601317077, 2936599872342895,14836021866212493, 71284139688101545] |