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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 28 |
| 2 | 782 |
| 3 | 21868 |
| 4 | 611522 |
| 5 | 17100748 |
| 6 | 478209422 |
| 7 | 13372763068 |
| 8 | 373959156482 |
| 9 | 10457483618428 |
| 10 | 292435582159502 |
| 11 | 8177738816847628 |
| 12 | 228684251289574082 |
| 13 | 6394981297291226668 |
| 14 | 178830792072864772622 |
| 15 | 5000867196742922406748 |
[2,28,782,21868,611522,17100748,478209422, 13372763068,373959156482,10457483618428, 292435582159502,8177738816847628, 228684251289574082,6394981297291226668, 178830792072864772622,5000867196742922406748] |