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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 82 |
| 4 | 1724 |
| 5 | 47223 |
| 6 | 1555047 |
| 7 | 58892186 |
| 8 | 2496826094 |
| 9 | 116434989450 |
| 10 | 5900151126856 |
| 11 | 322048641354617 |
| 12 | 18810964989814291 |
| 13 | 1169843128503194025 |
| 14 | 77145176721564799777 |
| 15 | 5376524285402806746719 |
| 16 | 394887654026596322701724 |
| 17 | 30489608056346314234108286 |
| 18 | 2469347798211941105406473481 |
[1,1,6,82,1724,47223,1555047,58892186,2496826094, 116434989450,5900151126856,322048641354617, 18810964989814291,1169843128503194025, 77145176721564799777,5376524285402806746719, 394887654026596322701724, 30489608056346314234108286, 2469347798211941105406473481] |