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| n | a(n) |
|---|---|
| 0 | 18 |
| 1 | 109 |
| 2 | 3942 |
| 3 | 23761 |
| 4 | 859338 |
| 5 | 5179789 |
| 6 | 187331742 |
| 7 | 1129170241 |
| 8 | 40837460418 |
| 9 | 246153932749 |
| 10 | 8902379039382 |
| 11 | 53660428169041 |
| 12 | 1940677793124858 |
| 13 | 11697727186918189 |
| 14 | 423058856522179662 |
| 15 | 2550050866319996161 |
| 16 | 92224890044042041458 |
| 17 | 555899391130572244909 |
[18,109,3942,23761,859338,5179789,187331742, 1129170241,40837460418,246153932749,8902379039382, 53660428169041,1940677793124858,11697727186918189, 423058856522179662,2550050866319996161, 92224890044042041458,555899391130572244909] |