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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 91 |
| 4 | 796 |
| 5 | 6811 |
| 6 | 57538 |
| 7 | 482428 |
| 8 | 4027198 |
| 9 | 33533347 |
| 10 | 278825162 |
| 11 | 2316566625 |
| 12 | 19238562967 |
| 13 | 159736102670 |
| 14 | 1326123416205 |
| 15 | 11008816380694 |
| 16 | 91387386606731 |
| 17 | 758625343258587 |
| 18 | 6297482302540006 |
| 19 | 52276487973857019 |
| 20 | 433956473301625611 |
| 21 | 3602353814161346305 |
[1,1,10,91,796,6811,57538,482428,4027198,33533347, 278825162,2316566625,19238562967,159736102670, 1326123416205,11008816380694,91387386606731, 758625343258587,6297482302540006, 52276487973857019,433956473301625611, 3602353814161346305] |