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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 11 |
| 3 | 90 |
| 4 | 721 |
| 5 | 5771 |
| 6 | 46170 |
| 7 | 369361 |
| 8 | 2954891 |
| 9 | 23639130 |
| 10 | 189113041 |
| 11 | 1512904331 |
| 12 | 12103234650 |
| 13 | 96825877201 |
| 14 | 774607017611 |
| 15 | 6196856140890 |
| 16 | 49574849127121 |
| 17 | 396598793016971 |
| 18 | 3172790344135770 |
| 19 | 25382322753086161 |
| 20 | 203058582024689291 |
| 21 | 1624468656197514330 |
[1,11,90,721,5771,46170,369361,2954891,23639130, 189113041,1512904331,12103234650,96825877201, 774607017611,6196856140890,49574849127121, 396598793016971,3172790344135770, 25382322753086161,203058582024689291, 1624468656197514330] |