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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 51 |
| 3 | 1174 |
| 4 | 39833 |
| 5 | 1799136 |
| 6 | 101821723 |
| 7 | 6938396368 |
| 8 | 553482404721 |
| 9 | 50619262481920 |
| 10 | 5223014483031491 |
| 11 | 600332651141435136 |
| 12 | 76075005337204547209 |
| 13 | 10538051760153093320704 |
| 14 | 1584264031801742560408875 |
| 15 | 256912816791069951740348416 |
| 16 | 44703731640012047610981808097 |
[1,4,51,1174,39833,1799136,101821723,6938396368, 553482404721,50619262481920,5223014483031491, 600332651141435136,76075005337204547209, 10538051760153093320704,1584264031801742560408875, 256912816791069951740348416, 44703731640012047610981808097] |