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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 28 |
| 3 | 355 |
| 4 | 5264 |
| 5 | 85764 |
| 6 | 1488432 |
| 7 | 27030861 |
| 8 | 507976040 |
| 9 | 9804514720 |
| 10 | 193339562208 |
| 11 | 3880220133244 |
| 12 | 79026982569976 |
| 13 | 1629698960355600 |
| 14 | 33969388149210240 |
| 15 | 714666181953790035 |
| 16 | 15158444163422689080 |
| 17 | 323839596100845917400 |
| 18 | 6962822068346268247200 |
| 19 | 150567286583848676406480 |
[1,3,28,355,5264,85764,1488432,27030861,507976040, 9804514720,193339562208,3880220133244, 79026982569976,1629698960355600,33969388149210240, 714666181953790035,15158444163422689080, 323839596100845917400,6962822068346268247200, 150567286583848676406480] |