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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 16 |
| 4 | 184 |
| 5 | 2696 |
| 6 | 47466 |
| 7 | 979776 |
| 8 | 23059204 |
| 9 | 567108864 |
| 10 | 14712104501 |
| 11 | 421504185344 |
| 12 | 13218256749601 |
| 13 | 450353989316608 |
| 14 | 16565151205544957 |
| 15 | 654244800082329600 |
| 16 | 27614800115689879553 |
| 17 | 1240529732459024678912 |
| 18 | 59095217374989483261925 |
| 19 | 2975557672677668838178816 |
| 20 | 157904201452248753415276001 |
[1,3,16,184,2696,47466,979776,23059204,567108864, 14712104501,421504185344,13218256749601, 450353989316608,16565151205544957, 654244800082329600,27614800115689879553, 1240529732459024678912,59095217374989483261925, 2975557672677668838178816, 157904201452248753415276001] |