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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 476 |
| 4 | 12380 |
| 5 | 386220 |
| 6 | 13821276 |
| 7 | 552876504 |
| 8 | 24318017424 |
| 9 | 1162989779660 |
| 10 | 59987353249560 |
| 11 | 3316841570302680 |
| 12 | 195648523068917828 |
| 13 | 12263065689662763024 |
| 14 | 814027053454694421000 |
| 15 | 57059908657536257254704 |
| 16 | 4212606733712173668180012 |
| 17 | 326799750176069289173027820 |
[1,2,24,476,12380,386220,13821276,552876504, 24318017424,1162989779660,59987353249560, 3316841570302680,195648523068917828, 12263065689662763024,814027053454694421000, 57059908657536257254704,4212606733712173668180012, 326799750176069289173027820] |