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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 23 |
| 3 | 230 |
| 4 | 2395 |
| 5 | 25518 |
| 6 | 276298 |
| 7 | 3026790 |
| 8 | 33452225 |
| 9 | 372278104 |
| 10 | 4165976594 |
| 11 | 46831604742 |
| 12 | 528454140310 |
| 13 | 5982318103300 |
| 14 | 67908970800315 |
| 15 | 772718361911646 |
| 16 | 8810943692302959 |
| 17 | 100652401936330376 |
| 18 | 1151695085791305180 |
| 19 | 13197378357577994370 |
[1,2,23,230,2395,25518,276298,3026790,33452225, 372278104,4165976594,46831604742,528454140310, 5982318103300,67908970800315,772718361911646, 8810943692302959,100652401936330376, 1151695085791305180,13197378357577994370] |