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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 29 |
| 4 | 444 |
| 5 | 9454 |
| 6 | 257822 |
| 7 | 8576504 |
| 8 | 336770592 |
| 9 | 15246592440 |
| 10 | 781883091672 |
| 11 | 44797478362680 |
| 12 | 2836034500712256 |
| 13 | 196601715537070752 |
| 14 | 14811696896760459264 |
| 15 | 1205008924460733794688 |
| 16 | 105284627507520312994560 |
| 17 | 9832559605580777568425856 |
[0,1,3,29,444,9454,257822,8576504,336770592, 15246592440,781883091672,44797478362680, 2836034500712256,196601715537070752, 14811696896760459264,1205008924460733794688, 105284627507520312994560, 9832559605580777568425856] |