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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 27 |
| 4 | 193 |
| 5 | 1391 |
| 6 | 10072 |
| 7 | 72941 |
| 8 | 528283 |
| 9 | 3826157 |
| 10 | 27711478 |
| 11 | 200704271 |
| 12 | 1453628917 |
| 13 | 10528111931 |
| 14 | 76251331828 |
| 15 | 552260998337 |
| 16 | 3999827976463 |
| 17 | 28969316843801 |
| 18 | 209814352850962 |
| 19 | 1519609968699971 |
| 20 | 11005988987858473 |
[1,5,27,193,1391,10072,72941,528283,3826157, 27711478,200704271,1453628917,10528111931, 76251331828,552260998337,3999827976463, 28969316843801,209814352850962,1519609968699971, 11005988987858473] |