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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 311 |
| 3 | 2491 |
| 4 | 23371 |
| 5 | 222781 |
| 6 | 2175107 |
| 7 | 21527229 |
| 8 | 215372643 |
| 9 | 2172481855 |
| 10 | 22058146721 |
| 11 | 225160434299 |
| 12 | 2308475903215 |
| 13 | 23755239389679 |
| 14 | 245216829211791 |
| 15 | 2538058380864601 |
| 16 | 26330120051697475 |
| 17 | 273697415480399349 |
[1,31,311,2491,23371,222781,2175107,21527229, 215372643,2172481855,22058146721,225160434299, 2308475903215,23755239389679,245216829211791, 2538058380864601,26330120051697475, 273697415480399349] |