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| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 8 |
| 2 | 28 |
| 3 | 172 |
| 4 | 1231 |
| 5 | 9588 |
| 6 | 78543 |
| 7 | 665140 |
| 8 | 5768004 |
| 9 | 50917519 |
| 10 | 455743004 |
| 11 | 4124599869 |
| 12 | 37668527415 |
| 13 | 346621096885 |
| 14 | 3210012022164 |
| 15 | 29890794226982 |
| 16 | 279660033612131 |
| 17 | 2627410589445923 |
| 18 | 24775244142175635 |
| 19 | 234381646366460804 |
[-1,8,28,172,1231,9588,78543,665140,5768004, 50917519,455743004,4124599869,37668527415, 346621096885,3210012022164,29890794226982, 279660033612131,2627410589445923, 24775244142175635,234381646366460804] |