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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 19 |
| 5 | 136 |
| 6 | 3036 |
| 7 | 151848 |
| 8 | 16814116 |
| 9 | 3818273456 |
| 10 | 1759237059488 |
| 11 | 1637673128642016 |
| 12 | 3074457382841680224 |
| 13 | 11624286729262765320064 |
| 14 | 88424288520685885682129216 |
| 15 | 1352160640243480723729126645248 |
| 16 | 41538374868278630828076760060403776 |
| 17 | 2562126056816477844908944991509312669696 |
[1,2,4,19,136,3036,151848,16814116,3818273456, 1759237059488,1637673128642016, 3074457382841680224,11624286729262765320064, 88424288520685885682129216, 1352160640243480723729126645248, 41538374868278630828076760060403776, 2562126056816477844908944991509312669696] |