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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 513 |
| 3 | 7844 |
| 4 | 109073 |
| 5 | 1435884 |
| 6 | 18284641 |
| 7 | 228039988 |
| 8 | 2806440945 |
| 9 | 34241833340 |
| 10 | 415442661569 |
| 11 | 5021759035332 |
| 12 | 60553294750417 |
| 13 | 728980076982796 |
| 14 | 8766500495230497 |
| 15 | 105347998786683476 |
| 16 | 1265376309596698289 |
[1,28,513,7844,109073,1435884,18284641,228039988, 2806440945,34241833340,415442661569,5021759035332, 60553294750417,728980076982796,8766500495230497, 105347998786683476,1265376309596698289] |