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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 244 |
| 4 | 554 |
| 5 | 202084 |
| 6 | 2162212 |
| 7 | 1594887848 |
| 8 | 7756604858 |
| 9 | 9619518701764 |
| 10 | 59259390118004 |
| 11 | 554790995145103208 |
| 12 | 954740563911205348 |
| 13 | 32696580074344991138888 |
| 14 | 105453443486621462355224 |
| 15 | 7064702291984369672858925136 |
| 16 | 4176926860695042104392112698 |
[1,2,10,244,554,202084,2162212,1594887848, 7756604858,9619518701764,59259390118004, 554790995145103208,954740563911205348, 32696580074344991138888,105453443486621462355224, 7064702291984369672858925136, 4176926860695042104392112698] |