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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 160 |
| 4 | 2444 |
| 5 | 45792 |
| 6 | 1005480 |
| 7 | 25169760 |
| 8 | 705321200 |
| 9 | 21841420384 |
| 10 | 740194188032 |
| 11 | 27243674154368 |
| 12 | 1082259310732096 |
| 13 | 46159435144505600 |
| 14 | 2104195645965319680 |
| 15 | 102113572703197079040 |
| 16 | 5256795948307255075584 |
| 17 | 286171738279517073904128 |
| 18 | 16427146596936396844976640 |
[1,2,14,160,2444,45792,1005480,25169760,705321200, 21841420384,740194188032,27243674154368, 1082259310732096,46159435144505600, 2104195645965319680,102113572703197079040, 5256795948307255075584,286171738279517073904128, 16427146596936396844976640] |