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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 32 |
| 4 | 400 |
| 5 | 6784 |
| 6 | 144128 |
| 7 | 3658752 |
| 8 | 107686656 |
| 9 | 3599697920 |
| 10 | 134617038848 |
| 11 | 5567255822336 |
| 12 | 252278661832704 |
| 13 | 12431395516383232 |
| 14 | 661885541595873280 |
| 15 | 37869659304097218560 |
| 16 | 2317293119684500193280 |
| 17 | 151022143036329696952320 |
[1,1,4,32,400,6784,144128,3658752,107686656, 3599697920,134617038848,5567255822336, 252278661832704,12431395516383232, 661885541595873280,37869659304097218560, 2317293119684500193280,151022143036329696952320] |