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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 513 |
| 3 | 7808 |
| 4 | 107309 |
| 5 | 1384836 |
| 6 | 17143081 |
| 7 | 206182696 |
| 8 | 2429008197 |
| 9 | 28183193324 |
| 10 | 323282753729 |
| 11 | 3676063130064 |
| 12 | 41519535153565 |
| 13 | 466480044231892 |
| 14 | 5219284450672857 |
| 15 | 58204869911960312 |
| 16 | 647392469287421813 |
[1,28,513,7808,107309,1384836,17143081,206182696, 2429008197,28183193324,323282753729,3676063130064, 41519535153565,466480044231892,5219284450672857, 58204869911960312,647392469287421813] |