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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 38 |
| 3 | 786 |
| 4 | 22888 |
| 5 | 857800 |
| 6 | 39316464 |
| 7 | 2130380560 |
| 8 | 133222474368 |
| 9 | 9443111340672 |
| 10 | 748168002970880 |
| 11 | 65520799156209408 |
| 12 | 6284786657494483968 |
| 13 | 655287035001111884800 |
| 14 | 73792143714173551392768 |
| 15 | 8925528145554323771934720 |
| 16 | 1154065253662722209679572992 |
| 17 | 158849709577131169400652988416 |
[1,3,38,786,22888,857800,39316464,2130380560, 133222474368,9443111340672,748168002970880, 65520799156209408,6284786657494483968, 655287035001111884800,73792143714173551392768, 8925528145554323771934720, 1154065253662722209679572992, 158849709577131169400652988416] |