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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 71 |
| 5 | 388 |
| 6 | 2592 |
| 7 | 21096 |
| 8 | 204638 |
| 9 | 2317172 |
| 10 | 30024276 |
| 11 | 437469859 |
| 12 | 7067109598 |
| 13 | 125184509147 |
| 14 | 2410455693765 |
| 15 | 50101933643655 |
| 16 | 1117669367609605 |
| 17 | 26629298567576331 |
| 18 | 674793598023809924 |
| 19 | 18119844622209998036 |
[2,5,17,71,388,2592,21096,204638,2317172,30024276, 437469859,7067109598,125184509147,2410455693765, 50101933643655,1117669367609605,26629298567576331, 674793598023809924,18119844622209998036] |