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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 14 |
| 3 | 212 |
| 4 | 5060 |
| 5 | 163612 |
| 6 | 6627896 |
| 7 | 321431160 |
| 8 | 18124740188 |
| 9 | 1164431516480 |
| 10 | 83964054624948 |
| 11 | 6716502875164072 |
| 12 | 590440591362465196 |
| 13 | 56598091771350294496 |
| 14 | 5876895519035724906276 |
| 15 | 657270233781923280277160 |
| 16 | 78784141824808570443009244 |
| 17 | 10077258172565896291161041472 |
| 18 | 1370190694994211436654204353668 |
[1,2,14,212,5060,163612,6627896,321431160, 18124740188,1164431516480,83964054624948, 6716502875164072,590440591362465196, 56598091771350294496,5876895519035724906276, 657270233781923280277160, 78784141824808570443009244, 10077258172565896291161041472, 1370190694994211436654204353668] |