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| n | a(n) |
|---|---|
| 0 | 28 |
| 1 | 57 |
| 2 | 3220 |
| 3 | 6497 |
| 4 | 367052 |
| 5 | 740601 |
| 6 | 41840708 |
| 7 | 84422017 |
| 8 | 4769473660 |
| 9 | 9623369337 |
| 10 | 543678156532 |
| 11 | 1096979682401 |
| 12 | 61974540370988 |
| 13 | 125046060424377 |
| 14 | 7064553924136100 |
| 15 | 14254153908696577 |
| 16 | 805297172811144412 |
[28,57,3220,6497,367052,740601,41840708,84422017, 4769473660,9623369337,543678156532,1096979682401, 61974540370988,125046060424377,7064553924136100, 14254153908696577,805297172811144412] |