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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 16 |
| 3 | 435 |
| 4 | 7136 |
| 5 | 99350 |
| 6 | 1234032 |
| 7 | 14219212 |
| 8 | 155251840 |
| 9 | 1628202762 |
| 10 | 16550991200 |
| 11 | 164111079110 |
| 12 | 1594594348800 |
| 13 | 15235525651840 |
| 14 | 143518352447680 |
| 15 | 1335670583147400 |
| 16 | 12301278983461376 |
| 17 | 112264111607438906 |
| 18 | 1016361486936571680 |
| 19 | 9136254276320346046 |
[1,16,435,7136,99350,1234032,14219212,155251840, 1628202762,16550991200,164111079110,1594594348800, 15235525651840,143518352447680,1335670583147400, 12301278983461376,112264111607438906, 1016361486936571680,9136254276320346046] |