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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 139 |
| 3 | 8812 |
| 4 | 398508 |
| 5 | 22533687 |
| 6 | 1509143496 |
| 7 | 90139418667 |
| 8 | 5406371366046 |
| 9 | 345027685293581 |
| 10 | 21781937201310642 |
| 11 | 1364248599882667154 |
| 12 | 86845415914930878736 |
| 13 | 5551683807912172844571 |
| 14 | 354345805660601775721536 |
[2,139,8812,398508,22533687,1509143496, 90139418667,5406371366046,345027685293581, 21781937201310642,1364248599882667154, 86845415914930878736,5551683807912172844571, 354345805660601775721536] |