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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 83 |
| 5 | 417 |
| 6 | 3928 |
| 7 | 127425 |
| 8 | 4782725 |
| 9 | 285886827 |
| 10 | 29305144137 |
| 11 | 5078448221965 |
| 12 | 1689709601427846 |
| 13 | 898792333612812818 |
| 14 | 812773906928265250254 |
| 15 | 1327574905899625395329686 |
[1,2,12,83,417,3928,127425,4782725,285886827, 29305144137,5078448221965,1689709601427846, 898792333612812818,812773906928265250254, 1327574905899625395329686] |