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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 518 |
| 3 | 7988 |
| 4 | 111279 |
| 5 | 1454376 |
| 6 | 18208156 |
| 7 | 221140696 |
| 8 | 2626932077 |
| 9 | 30692791844 |
| 10 | 354119115714 |
| 11 | 4046102802924 |
| 12 | 45880411771195 |
| 13 | 517157095113232 |
| 14 | 5801772397167992 |
| 15 | 64842434348911472 |
| 16 | 722511991410929433 |
[1,28,518,7988,111279,1454376,18208156,221140696, 2626932077,30692791844,354119115714,4046102802924, 45880411771195,517157095113232,5801772397167992, 64842434348911472,722511991410929433] |