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| n | a(n) |
|---|---|
| 0 | 21 |
| 1 | 22 |
| 2 | 43 |
| 3 | 237 |
| 4 | 280 |
| 5 | 517 |
| 6 | 797 |
| 7 | 4502 |
| 8 | 5299 |
| 9 | 9801 |
| 10 | 416941 |
| 11 | 426742 |
| 12 | 843683 |
| 13 | 4645157 |
| 14 | 5488840 |
| 15 | 10133997 |
| 16 | 15622837 |
| 17 | 88248182 |
| 18 | 103871019 |
| 19 | 192119201 |
| 20 | 8172877461 |
| 21 | 8364996662 |
| 22 | 16537874123 |
| 23 | 91054367277 |
| 24 | 107592241400 |
| 25 | 198646608677 |
| 26 | 306238850077 |
| 27 | 1729840859062 |
[21,22,43,237,280,517,797,4502,5299,9801,416941, 426742,843683,4645157,5488840,10133997,15622837, 88248182,103871019,192119201,8172877461, 8364996662,16537874123,91054367277,107592241400, 198646608677,306238850077,1729840859062] |