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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 10 |
| 4 | 79 |
| 5 | 625 |
| 6 | 5338 |
| 7 | 47980 |
| 8 | 443863 |
| 9 | 4199725 |
| 10 | 40488645 |
| 11 | 396277790 |
| 12 | 3926803372 |
| 13 | 39318663510 |
| 14 | 397204242668 |
| 15 | 4043453280880 |
| 16 | 41436730885983 |
| 17 | 427132429010270 |
| 18 | 4425813361407403 |
| 19 | 46071637231461810 |
| 20 | 481590765650318937 |
| 21 | 5053016372165798032 |
[1,1,1,10,79,625,5338,47980,443863,4199725, 40488645,396277790,3926803372,39318663510, 397204242668,4043453280880,41436730885983, 427132429010270,4425813361407403, 46071637231461810,481590765650318937, 5053016372165798032] |