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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 39 |
| 3 | 2188 |
| 4 | 247465 |
| 5 | 47290506 |
| 6 | 13732594855 |
| 7 | 5645761143968 |
| 8 | 3124313624563281 |
| 9 | 2240929551882269890 |
| 10 | 2023001689428835457551 |
| 11 | 2245340983227461222262600 |
| 12 | 3005921392102922941037743561 |
| 13 | 4777188534537036418050441999458 |
| 14 | 8892651921874938986718539648539335 |
| 15 | 19167346139929272962512547586833106016 |
| 16 | 47363669252787891219004826832547428944065 |
| 17 | 133017373943189884985366059167726505579520322 |
| 18 | 421334607602498277189468756234637306051458074191 |
| 19 | 1495034827615578030423476599123008111000477082402040 |
| 20 | 5906697677063490360959940664316005473632429506949424681 |
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