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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 21 |
| 2 | 241 |
| 3 | 2661 |
| 4 | 29281 |
| 5 | 322101 |
| 6 | 3543121 |
| 7 | 38974341 |
| 8 | 428717761 |
| 9 | 4715895381 |
| 10 | 51874849201 |
| 11 | 570623341221 |
| 12 | 6276856753441 |
| 13 | 69045424287861 |
| 14 | 759499667166481 |
| 15 | 8354496338831301 |
| 16 | 91899459727144321 |
| 17 | 1010894056998587541 |
| 18 | 11119834626984462961 |
[1,21,241,2661,29281,322101,3543121,38974341, 428717761,4715895381,51874849201,570623341221, 6276856753441,69045424287861,759499667166481, 8354496338831301,91899459727144321, 1010894056998587541,11119834626984462961] |