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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 14 |
| 3 | 82 |
| 4 | 478 |
| 5 | 2786 |
| 6 | 16238 |
| 7 | 94642 |
| 8 | 551614 |
| 9 | 3215042 |
| 10 | 18738638 |
| 11 | 109216786 |
| 12 | 636562078 |
| 13 | 3710155682 |
| 14 | 21624372014 |
| 15 | 126036076402 |
| 16 | 734592086398 |
| 17 | 4281516441986 |
| 18 | 24954506565518 |
| 19 | 145445522951122 |
| 20 | 847718631141214 |
| 21 | 4940866263896162 |
| 22 | 28797478952235758 |
| 23 | 167844007449518386 |
[2,14,82,478,2786,16238,94642,551614,3215042, 18738638,109216786,636562078,3710155682, 21624372014,126036076402,734592086398, 4281516441986,24954506565518,145445522951122, 847718631141214,4940866263896162, 28797478952235758,167844007449518386] |