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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 188 |
| 4 | 2896 |
| 5 | 50452 |
| 6 | 953056 |
| 7 | 19003476 |
| 8 | 394397776 |
| 9 | 8439756848 |
| 10 | 185033251616 |
| 11 | 4137181680700 |
| 12 | 94020327215200 |
| 13 | 2166105078791448 |
| 14 | 50489825388328608 |
| 15 | 1188777328563914488 |
| 16 | 28236363841989180496 |
| 17 | 675879582290807439796 |
| 18 | 16289254212704277185152 |
[1,2,16,188,2896,50452,953056,19003476,394397776, 8439756848,185033251616,4137181680700, 94020327215200,2166105078791448,50489825388328608, 1188777328563914488,28236363841989180496, 675879582290807439796,16289254212704277185152] |