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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 91 |
| 4 | 865 |
| 5 | 8155 |
| 6 | 77251 |
| 7 | 730435 |
| 8 | 6905560 |
| 9 | 65233120 |
| 10 | 615847378 |
| 11 | 5810270782 |
| 12 | 54784324495 |
| 13 | 516250199827 |
| 14 | 4862041512625 |
| 15 | 45765734635702 |
| 16 | 430560567351208 |
| 17 | 4048630897384450 |
| 18 | 38051334554031551 |
| 19 | 357459295903931045 |
| 20 | 3356488167698692226 |
| 21 | 31503001136703776561 |
[1,1,10,91,865,8155,77251,730435,6905560,65233120, 615847378,5810270782,54784324495,516250199827, 4862041512625,45765734635702,430560567351208, 4048630897384450,38051334554031551, 357459295903931045,3356488167698692226, 31503001136703776561] |