| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 18 |
| 5 | 27 |
| 6 | 37 |
| 7 | 415 |
| 8 | 445 |
| 9 | 1812 |
| 10 | 2475 |
| 11 | 3928 |
| 12 | 6707 |
| 13 | 14673 |
| 14 | 65863 |
| 15 | 89033 |
| 16 | 265841 |
| 17 | 1293955 |
| 18 | 1525697 |
| 19 | 2541166 |
| 20 | 7906280 |
| 21 | 107955268 |
| 22 | 154190828 |
| 23 | 887303031 |
| 24 | 1767107652 |
| 25 | 3068165143 |
| 26 | 3209500563 |
| 27 | 92762706640 |
| 28 | 147991352023 |
[3,4,5,18,27,37,415,445,1812,2475,3928,6707,14673, 65863,89033,265841,1293955,1525697,2541166, 7906280,107955268,154190828,887303031,1767107652, 3068165143,3209500563,92762706640,147991352023] |