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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 27 |
| 3 | 141 |
| 4 | 738 |
| 5 | 3866 |
| 6 | 20249 |
| 7 | 106056 |
| 8 | 555483 |
| 9 | 2909419 |
| 10 | 15238479 |
| 11 | 79813616 |
| 12 | 418034724 |
| 13 | 2189514005 |
| 14 | 11467878868 |
| 15 | 60064583029 |
| 16 | 314596463387 |
| 17 | 1647741976789 |
| 18 | 8630273820766 |
| 19 | 45202238742834 |
| 20 | 236752903766237 |
| 21 | 1240025693431636 |
[5,27,141,738,3866,20249,106056,555483,2909419, 15238479,79813616,418034724,2189514005, 11467878868,60064583029,314596463387, 1647741976789,8630273820766,45202238742834, 236752903766237,1240025693431636] |