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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 32 |
| 4 | 62 |
| 5 | 1764 |
| 6 | 3916 |
| 7 | 173376 |
| 8 | 393446 |
| 9 | 25166076 |
| 10 | 56406348 |
| 11 | 4958003840 |
| 12 | 10882283500 |
| 13 | 1264942740680 |
| 14 | 2721161685880 |
| 15 | 405344510959872 |
| 16 | 857860989902854 |
| 17 | 159511701001085164 |
| 18 | 333452808033317004 |
| 19 | 75711389658286217024 |
| 20 | 156849644184430434436 |
[1,2,2,32,62,1764,3916,173376,393446,25166076, 56406348,4958003840,10882283500,1264942740680, 2721161685880,405344510959872,857860989902854, 159511701001085164,333452808033317004, 75711389658286217024,156849644184430434436] |