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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 573 |
| 3 | 1274 |
| 4 | 4648 |
| 5 | 18273 |
| 6 | 75970 |
| 7 | 292458 |
| 8 | 1146690 |
| 9 | 4552661 |
| 10 | 17798866 |
| 11 | 69721893 |
| 12 | 274946713 |
| 13 | 1082756867 |
| 14 | 4261530095 |
| 15 | 16797596354 |
| 16 | 66211469842 |
| 17 | 260987419623 |
| 18 | 1029452503216 |
| 19 | 4061762711469 |
| 20 | 16027486319001 |
| 21 | 63263768157104 |
[5,573,1274,4648,18273,75970,292458,1146690, 4552661,17798866,69721893,274946713,1082756867, 4261530095,16797596354,66211469842,260987419623, 1029452503216,4061762711469,16027486319001, 63263768157104] |